131311100331221 has 4 divisors (see below), whose sum is σ = 131312338999200. Its totient is φ = 131309861663244.

The previous prime is 131311100331217. The next prime is 131311100331329. The reversal of 131311100331221 is 122133001113131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131311100331221 - 2² = 131311100331217 is a prime.

It is a super-3 number, since 3×131311100331221³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131311100321221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619174961 + ... + 619386998.

It is an arithmetic number, because the mean of its divisors is an integer number (32828084749800).

Almost surely, 2^{131311100331221} is an apocalyptic number.

It is an amenable number.

131311100331221 is a deficient number, since it is larger than the sum of its proper divisors (1238667979).

131311100331221 is a wasteful number, since it uses less digits than its factorization.

131311100331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238667978.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 131311100331221 its reverse (122133001113131), we get a palindrome (253444101444352).

The spelling of 131311100331221 in words is "one hundred thirty-one trillion, three hundred eleven billion, one hundred million, three hundred thirty-one thousand, two hundred twenty-one".