13531202121 has 16 divisors (see below), whose sum is σ = 18794462720. Its totient is φ = 8649711360.

The previous prime is 13531202057. The next prime is 13531202123. The reversal of 13531202121 is 12120213531.

It is not a de Polignac number, because 13531202121 - 2⁶ = 13531202057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531202123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657280 + ... + 677553.

It is an arithmetic number, because the mean of its divisors is an integer number (1174653920).

Almost surely, 2^13531202121 is an apocalyptic number.

It is an amenable number.

13531202121 is a deficient number, since it is larger than the sum of its proper divisors (5263260599).

13531202121 is a wasteful number, since it uses less digits than its factorization.

13531202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334976.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 13531202121 its reverse (12120213531), we get a palindrome (25651415652).

The spelling of 13531202121 in words is "thirteen billion, five hundred thirty-one million, two hundred two thousand, one hundred twenty-one".