21289125102 has 32 divisors (see below), whose sum is σ = 49115642112. Its totient is φ = 6025759104.

The previous prime is 21289125023. The next prime is 21289125131. The reversal of 21289125102 is 20152198212.

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, 2364123 + ... + 2373110.

It is an arithmetic number, because the mean of its divisors is an integer number (1534863816).

Almost surely, 2^21289125102 is an apocalyptic number.

21289125102 is an abundant number, since it is smaller than the sum of its proper divisors (27826517010).

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

21289125102 is a wasteful number, since it uses less digits than its factorization.

21289125102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4737352.

The product of its (nonzero) digits is 5760, while the sum is 33.

The spelling of 21289125102 in words is "twenty-one billion, two hundred eighty-nine million, one hundred twenty-five thousand, one hundred two".