131221133265 has 16 divisors (see below), whose sum is σ = 221004014400. Its totient is φ = 66301204032.

The previous prime is 131221133233. The next prime is 131221133279. The reversal of 131221133265 is 562331122131.

It is not a de Polignac number, because 131221133265 - 2⁵ = 131221133233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230212230 + ... + 230212799.

It is an arithmetic number, because the mean of its divisors is an integer number (13812750900).

Almost surely, 2^131221133265 is an apocalyptic number.

131221133265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131221133265 is a deficient number, since it is larger than the sum of its proper divisors (89782881135).

131221133265 is a wasteful number, since it uses less digits than its factorization.

131221133265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460425056.

The product of its digits is 6480, while the sum is 30.

Adding to 131221133265 its reverse (562331122131), we get a palindrome (693552255396).

The spelling of 131221133265 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-three thousand, two hundred sixty-five".