131221222110 has 72 divisors (see below), whose sum is σ = 375010763400. Its totient is φ = 31811202720.

The previous prime is 131221222081. The next prime is 131221222127. The reversal of 131221222110 is 11222122131.

131221222110 is a `hidden beast` number, since 1 + 312 + 21 + 222 + 110 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6013960 + ... + 6035739.

It is an arithmetic number, because the mean of its divisors is an integer number (5208482825).

Almost surely, 2^131221222110 is an apocalyptic number.

131221222110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221222110 is an abundant number, since it is smaller than the sum of its proper divisors (243789541290).

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

131221222110 is a wasteful number, since it uses less digits than its factorization.

131221222110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12049734 (or 12049720 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 131221222110 its reverse (11222122131), we get a palindrome (142443344241).

The spelling of 131221222110 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred ten".