21123031000212 has 72 divisors (see below), whose sum is σ = 54538932127680. Its totient is φ = 6891546130560.

The previous prime is 21123031000207. The next prime is 21123031000249. The reversal of 21123031000212 is 21200013032112.

21123031000212 is a `hidden beast` number, since 2 + 112 + 30 + 310 + 0 + 0 + 212 = 666.

21123031000212 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 30333912 + ... + 31022447.

It is an arithmetic number, because the mean of its divisors is an integer number (757485168440).

Almost surely, 2^{21123031000212} is an apocalyptic number.

It is an amenable number.

21123031000212 is an abundant number, since it is smaller than the sum of its proper divisors (33415901127468).

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

21123031000212 is a wasteful number, since it uses less digits than its factorization.

21123031000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61356573 (or 61356568 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21123031000212 its reverse (21200013032112), we get a palindrome (42323044032324).

The spelling of 21123031000212 in words is "twenty-one trillion, one hundred twenty-three billion, thirty-one million, two hundred twelve", and thus it is an aban number.