13215631356 has 24 divisors (see below), whose sum is σ = 34262748240. Its totient is φ = 4405210416.

The previous prime is 13215631349. The next prime is 13215631357. The reversal of 13215631356 is 65313651231.

13215631356 is a `hidden beast` number, since 1 + 3 + 2 + 15 + 631 + 3 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 13215631356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215631357) 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, 61183371 + ... + 61183586.

It is an arithmetic number, because the mean of its divisors is an integer number (1427614510).

Almost surely, 2^13215631356 is an apocalyptic number.

It is an amenable number.

13215631356 is an abundant number, since it is smaller than the sum of its proper divisors (21047116884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13215631356 is a wasteful number, since it uses less digits than its factorization.

13215631356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122366970 (or 122366962 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The spelling of 13215631356 in words is "thirteen billion, two hundred fifteen million, six hundred thirty-one thousand, three hundred fifty-six".