131221023321 has 16 divisors (see below), whose sum is σ = 176441630400. Its totient is φ = 86742132288.

The previous prime is 131221023299. The next prime is 131221023371. The reversal of 131221023321 is 123320122131.

It is not a de Polignac number, because 131221023321 - 2⁵ = 131221023289 is a prime.

It is a super-2 number, since 2×131221023321² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131221023371) 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, 134935 + ... + 529763.

It is an arithmetic number, because the mean of its divisors is an integer number (11027601900).

Almost surely, 2^131221023321 is an apocalyptic number.

It is an amenable number.

131221023321 is a deficient number, since it is larger than the sum of its proper divisors (45220607079).

131221023321 is a wasteful number, since it uses less digits than its factorization.

131221023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395768.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 131221023321 its reverse (123320122131), we get a palindrome (254541145452).

The spelling of 131221023321 in words is "one hundred thirty-one billion, two hundred twenty-one million, twenty-three thousand, three hundred twenty-one".