21360806313 has 32 divisors (see below), whose sum is σ = 35524654080. Its totient is φ = 11091591360.

The previous prime is 21360806309. The next prime is 21360806321. The reversal of 21360806313 is 31360806312.

It is not a de Polignac number, because 21360806313 - 2² = 21360806309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21360806303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 532506 + ... + 571212.

It is an arithmetic number, because the mean of its divisors is an integer number (1110145440).

Almost surely, 2^21360806313 is an apocalyptic number.

It is an amenable number.

21360806313 is a deficient number, since it is larger than the sum of its proper divisors (14163847767).

21360806313 is a wasteful number, since it uses less digits than its factorization.

21360806313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41117.

The product of its (nonzero) digits is 15552, while the sum is 33.

Subtracting 21360806313 from its reverse (31360806312), we obtain a palindrome (9999999999).

The spelling of 21360806313 in words is "twenty-one billion, three hundred sixty million, eight hundred six thousand, three hundred thirteen".