211212221202220 has 48 divisors (see below), whose sum is σ = 506910867240960. Its totient is φ = 72415399218624.

The previous prime is 211212221202211. The next prime is 211212221202223. The reversal of 211212221202220 is 22202122212112.

It is a super-2 number, since 2×211212221202220² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212221202191 and 211212221202200.

It is not an unprimeable number, because it can be changed into a prime (211212221202223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48008121 + ... + 52222639.

It is an arithmetic number, because the mean of its divisors is an integer number (10560643067520).

Almost surely, 2^{211212221202220} is an apocalyptic number.

211212221202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212221202220 is an abundant number, since it is smaller than the sum of its proper divisors (295698646038740).

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

211212221202220 is a wasteful number, since it uses less digits than its factorization.

211212221202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572502 (or 4572500 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211212221202220 its reverse (22202122212112), we get a palindrome (233414343414332).

The spelling of 211212221202220 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty".