211212004020 has 96 divisors (see below), whose sum is σ = 602889533568. Its totient is φ = 55238264832.

The previous prime is 211212004019. The next prime is 211212004049. The reversal of 211212004020 is 20400212112.

It is a super-2 number, since 2×211212004020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527472 + ... + 837048.

It is an arithmetic number, because the mean of its divisors is an integer number (6280099308).

Almost surely, 2^211212004020 is an apocalyptic number.

211212004020 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 211212004020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301444766784).

211212004020 is an abundant number, since it is smaller than the sum of its proper divisors (391677529548).

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

211212004020 is a wasteful number, since it uses less digits than its factorization.

211212004020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309809 (or 309807 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 211212004020 its reverse (20400212112), we get a palindrome (231612216132).

The spelling of 211212004020 in words is "two hundred eleven billion, two hundred twelve million, four thousand, twenty".