21312132013 has 8 divisors (see below), whose sum is σ = 21432024576. Its totient is φ = 21192326400.

The previous prime is 21312131969. The next prime is 21312132029. The reversal of 21312132013 is 31023121312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21312132013 - 2²¹ = 21310034861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312132313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505558 + ... + 546088.

It is an arithmetic number, because the mean of its divisors is an integer number (2679003072).

Almost surely, 2^21312132013 is an apocalyptic number.

It is an amenable number.

21312132013 is a deficient number, since it is larger than the sum of its proper divisors (119892563).

21312132013 is a wasteful number, since it uses less digits than its factorization.

21312132013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43475.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21312132013 its reverse (31023121312), we get a palindrome (52335253325).

The spelling of 21312132013 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, thirteen".