21312113132 has 24 divisors (see below), whose sum is σ = 37417476096. Its totient is φ = 10621442768.

The previous prime is 21312113113. The next prime is 21312113153. The reversal of 21312113132 is 23131121312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3101933 + ... + 3108795.

It is an arithmetic number, because the mean of its divisors is an integer number (1559061504).

Almost surely, 2^21312113132 is an apocalyptic number.

It is an amenable number.

21312113132 is a deficient number, since it is larger than the sum of its proper divisors (16105362964).

21312113132 is a wasteful number, since it uses less digits than its factorization.

21312113132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277 (or 9275 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 21312113132 its reverse (23131121312), we get a palindrome (44443234444).

The spelling of 21312113132 in words is "twenty-one billion, three hundred twelve million, one hundred thirteen thousand, one hundred thirty-two".