13215131521232 has 10 divisors (see below), whose sum is σ = 25604317322418. Its totient is φ = 6607565760608.

The previous prime is 13215131521219. The next prime is 13215131521253. The reversal of 13215131521232 is 23212513151231.

It can be written as a sum of positive squares in only one way, i.e., 10389894968896 + 2825236552336 = 3223336^2 + 1680844^2 .

It is a super-2 number, since 2×13215131521232² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412972860023 + ... + 412972860054.

Almost surely, 2^{13215131521232} is an apocalyptic number.

It is an amenable number.

13215131521232 is a deficient number, since it is larger than the sum of its proper divisors (12389185801186).

13215131521232 is an equidigital number, since it uses as much as digits as its factorization.

13215131521232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825945720085 (or 825945720079 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

Adding to 13215131521232 its reverse (23212513151231), we get a palindrome (36427644672463).

The spelling of 13215131521232 in words is "thirteen trillion, two hundred fifteen billion, one hundred thirty-one million, five hundred twenty-one thousand, two hundred thirty-two".