21121021000212 has 96 divisors (see below), whose sum is σ = 56421164190720. Its totient is φ = 6024037029120.

The previous prime is 21121021000147. The next prime is 21121021000213. The reversal of 21121021000212 is 21200012012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121021000191 and 21121021000200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121021000213) 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 31 ways as a sum of consecutive naturals, for example, 149959239 + ... + 150100017.

It is an arithmetic number, because the mean of its divisors is an integer number (587720460320).

Almost surely, 2^{21121021000212} is an apocalyptic number.

It is an amenable number.

21121021000212 is an abundant number, since it is smaller than the sum of its proper divisors (35300143190508).

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

21121021000212 is a wasteful number, since it uses less digits than its factorization.

21121021000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143901 (or 143899 counting only the distinct ones).

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

Adding to 21121021000212 its reverse (21200012012112), we get a palindrome (42321033012324).

The spelling of 21121021000212 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred twelve", and thus it is an aban number.