131221213113 has 32 divisors (see below), whose sum is σ = 189859686912. Its totient is φ = 80289536000.

The previous prime is 131221213111. The next prime is 131221213133. The reversal of 131221213113 is 311312122131.

It is a cyclic number.

It is not a de Polignac number, because 131221213113 - 2¹ = 131221213111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131221213113.

It is not an unprimeable number, because it can be changed into a prime (131221213111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4902595 + ... + 4929287.

It is an arithmetic number, because the mean of its divisors is an integer number (5933115216).

Almost surely, 2^131221213113 is an apocalyptic number.

It is an amenable number.

131221213113 is a deficient number, since it is larger than the sum of its proper divisors (58638473799).

131221213113 is a wasteful number, since it uses less digits than its factorization.

131221213113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29105.

The product of its digits is 216, while the sum is 21.

Adding to 131221213113 its reverse (311312122131), we get a palindrome (442533335244).

The spelling of 131221213113 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred thirteen".