211212210202020 has 144 divisors (see below), whose sum is σ = 642029239994688. Its totient is φ = 56204398091520.

The previous prime is 211212210201983. The next prime is 211212210202027. The reversal of 211212210202020 is 20202012212112.

It is a happy number.

211212210202020 is a `hidden beast` number, since 21 + 1 + 212 + 210 + 20 + 202 + 0 = 666.

It is a super-2 number, since 2×211212210202020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211212210201984 and 211212210202002.

It is not an unprimeable number, because it can be changed into a prime (211212210202027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1307678107 + ... + 1307839613.

It is an arithmetic number, because the mean of its divisors is an integer number (4458536388852).

Almost surely, 2^{211212210202020} is an apocalyptic number.

211212210202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211212210202020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321014619997344).

211212210202020 is an abundant number, since it is smaller than the sum of its proper divisors (430817029792668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211212210202020 is a wasteful number, since it uses less digits than its factorization.

211212210202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176810 (or 176805 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211212210202020 its reverse (20202012212112), we get a palindrome (231414222414132).

The spelling of 211212210202020 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred ten million, two hundred two thousand, twenty".