21012111202012 has 48 divisors (see below), whose sum is σ = 43077910563072. Its totient is φ = 8780144163840.

The previous prime is 21012111202007. The next prime is 21012111202031. The reversal of 21012111202012 is 21020211121012.

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, 14821189 + ... + 16176892.

It is an arithmetic number, because the mean of its divisors is an integer number (897456470064).

Almost surely, 2^{21012111202012} is an apocalyptic number.

It is an amenable number.

21012111202012 is an abundant number, since it is smaller than the sum of its proper divisors (22065799361060).

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

21012111202012 is a wasteful number, since it uses less digits than its factorization.

21012111202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30998698 (or 30998696 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012111202012 its reverse (21020211121012), we get a palindrome (42032322323024).

The spelling of 21012111202012 in words is "twenty-one trillion, twelve billion, one hundred eleven million, two hundred two thousand, twelve".