21100021122012 has 48 divisors (see below), whose sum is σ = 56671519591680. Its totient is φ = 5985206399232.

The previous prime is 21100021122001. The next prime is 21100021122043. The reversal of 21100021122012 is 21022112000112.

It is a junction number, because it is equal to n+sod(n) for n = 21100021121982 and 21100021122000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 903552093 + ... + 903575444.

It is an arithmetic number, because the mean of its divisors is an integer number (1180656658160).

Almost surely, 2^{21100021122012} is an apocalyptic number.

It is an amenable number.

21100021122012 is an abundant number, since it is smaller than the sum of its proper divisors (35571498469668).

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

21100021122012 is a wasteful number, since it uses less digits than its factorization.

21100021122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807127690 (or 1807127688 counting only the distinct ones).

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

Adding to 21100021122012 its reverse (21022112000112), we get a palindrome (42122133122124).

The spelling of 21100021122012 in words is "twenty-one trillion, one hundred billion, twenty-one million, one hundred twenty-two thousand, twelve".