21173136011313 has 64 divisors (see below), whose sum is σ = 34273639572480. Its totient is φ = 11455091424000.

The previous prime is 21173136011303. The next prime is 21173136011323. The reversal of 21173136011313 is 31311063137112.

It is an interprime number because it is at equal distance from previous prime (21173136011303) and next prime (21173136011323).

It is not a de Polignac number, because 21173136011313 - 2¹³ = 21173136003121 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 (21173136011303) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3818943 + ... + 7545236.

It is an arithmetic number, because the mean of its divisors is an integer number (535525618320).

Almost surely, 2^{21173136011313} is an apocalyptic number.

It is an amenable number.

21173136011313 is a deficient number, since it is larger than the sum of its proper divisors (13100503561167).

21173136011313 is a wasteful number, since it uses less digits than its factorization.

21173136011313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11364350.

The product of its (nonzero) digits is 6804, while the sum is 33.

Adding to 21173136011313 its reverse (31311063137112), we get a palindrome (52484199148425).

The spelling of 21173136011313 in words is "twenty-one trillion, one hundred seventy-three billion, one hundred thirty-six million, eleven thousand, three hundred thirteen".