13521212531 has 16 divisors (see below), whose sum is σ = 14806333440. Its totient is φ = 12297367680.

The previous prime is 13521212527. The next prime is 13521212587.

13521212531 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 13521212531 - 2² = 13521212527 is a prime.

It is a super-2 number, since 2×13521212531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13521212531.

It is not an unprimeable number, because it can be changed into a prime (13521212521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43985 + ... + 170226.

It is an arithmetic number, because the mean of its divisors is an integer number (925395840).

Almost surely, 2^13521212531 is an apocalyptic number.

13521212531 is a deficient number, since it is larger than the sum of its proper divisors (1285120909).

13521212531 is a wasteful number, since it uses less digits than its factorization.

13521212531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214354.

The product of its digits is 1800, while the sum is 26.

The spelling of 13521212531 in words is "thirteen billion, five hundred twenty-one million, two hundred twelve thousand, five hundred thirty-one".