21012210512 has 20 divisors (see below), whose sum is σ = 40980772896. Its totient is φ = 10436527200.

The previous prime is 21012210509. The next prime is 21012210553. The reversal of 21012210512 is 21501221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4346138 + ... + 4350969.

Almost surely, 2^21012210512 is an apocalyptic number.

It is an amenable number.

21012210512 is a deficient number, since it is larger than the sum of its proper divisors (19968562384).

21012210512 is a wasteful number, since it uses less digits than its factorization.

21012210512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8697266 (or 8697260 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21012210512 its reverse (21501221012), we get a palindrome (42513431524).

The spelling of 21012210512 in words is "twenty-one billion, twelve million, two hundred ten thousand, five hundred twelve".