21012012210120 has 256 divisors, whose sum is σ = 66790351872000. Its totient is φ = 5273473766400.

The previous prime is 21012012210083. The next prime is 21012012210149. The reversal of 21012012210120 is 2101221021012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21012012210120.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 229365525 + ... + 229457115.

It is an arithmetic number, because the mean of its divisors is an integer number (260899812000).

Almost surely, 2^{21012012210120} is an apocalyptic number.

21012012210120 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 21012012210120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33395175936000).

21012012210120 is an abundant number, since it is smaller than the sum of its proper divisors (45778339661880).

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

21012012210120 is a wasteful number, since it uses less digits than its factorization.

21012012210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92284 (or 92280 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012012210120 its reverse (2101221021012), we get a palindrome (23113233231132).

The spelling of 21012012210120 in words is "twenty-one trillion, twelve billion, twelve million, two hundred ten thousand, one hundred twenty".