21312002132 has 12 divisors (see below), whose sum is σ = 37297098720. Its totient is φ = 10655688216.

The previous prime is 21312002113. The next prime is 21312002143. The reversal of 21312002132 is 23120021312.

It is a self number, because there is not a number n which added to its sum of digits gives 21312002132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147323 + ... + 253629.

It is an arithmetic number, because the mean of its divisors is an integer number (3108091560).

Almost surely, 2^21312002132 is an apocalyptic number.

It is an amenable number.

21312002132 is a deficient number, since it is larger than the sum of its proper divisors (15985096588).

21312002132 is a wasteful number, since it uses less digits than its factorization.

21312002132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156430 (or 156428 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21312002132 its reverse (23120021312), we get a palindrome (44432023444).

The spelling of 21312002132 in words is "twenty-one billion, three hundred twelve million, two thousand, one hundred thirty-two".