131221147760724 has 96 divisors (see below), whose sum is σ = 351098020094976. Its totient is φ = 37365892462080.

The previous prime is 131221147760707. The next prime is 131221147760737. The reversal of 131221147760724 is 427067741122131.

It is a super-2 number, since 2×131221147760724² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262607479 + ... + 263106689.

It is an arithmetic number, because the mean of its divisors is an integer number (3657271042656).

Almost surely, 2^{131221147760724} is an apocalyptic number.

131221147760724 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

131221147760724 is an abundant number, since it is smaller than the sum of its proper divisors (219876872334252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131221147760724 is a wasteful number, since it uses less digits than its factorization.

131221147760724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509725 (or 509723 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 48.

Adding to 131221147760724 its reverse (427067741122131), we get a palindrome (558288888882855).

The spelling of 131221147760724 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, one hundred forty-seven million, seven hundred sixty thousand, seven hundred twenty-four".