21312132102 has 40 divisors (see below), whose sum is σ = 48564390600. Its totient is φ = 6983633376.

The previous prime is 21312132071. The next prime is 21312132199. The reversal of 21312132102 is 20123121312.

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 polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1105327 + ... + 1124442.

It is an arithmetic number, because the mean of its divisors is an integer number (1214109765).

Almost surely, 2^21312132102 is an apocalyptic number.

21312132102 is an abundant number, since it is smaller than the sum of its proper divisors (27252258498).

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

21312132102 is a wasteful number, since it uses less digits than its factorization.

21312132102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229842 (or 2229833 counting only the distinct ones).

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

Adding to 21312132102 its reverse (20123121312), we get a palindrome (41435253414).

The spelling of 21312132102 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, one hundred two".