131221215126 has 24 divisors (see below), whose sum is σ = 286123547424. Its totient is φ = 43461802800.

The previous prime is 131221215107. The next prime is 131221215161. The reversal of 131221215126 is 621512122131.

It is a happy number.

131221215126 is a `hidden beast` number, since 1 + 3 + 1 + 22 + 121 + 512 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 131221215126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23213950 + ... + 23219601.

It is an arithmetic number, because the mean of its divisors is an integer number (11921814476).

Almost surely, 2^131221215126 is an apocalyptic number.

131221215126 is an abundant number, since it is smaller than the sum of its proper divisors (154902332298).

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

131221215126 is a wasteful number, since it uses less digits than its factorization.

131221215126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46433716 (or 46433713 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

Adding to 131221215126 its reverse (621512122131), we get a palindrome (752733337257).

The spelling of 131221215126 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred fifteen thousand, one hundred twenty-six".