1321986815136 has 72 divisors (see below), whose sum is σ = 4048584632820. Its totient is φ = 406765172736.

The previous prime is 1321986815077. The next prime is 1321986815213. The reversal of 1321986815136 is 6315186891231.

1321986815136 is a `hidden beast` number, since 1 + 32 + 1 + 98 + 6 + 8 + 1 + 513 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1321166336400 + 820478736 = 1149420^2 + 28644^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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, 176543641 + ... + 176551128.

Almost surely, 2^{1321986815136} is an apocalyptic number.

1321986815136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321986815136 is an abundant number, since it is smaller than the sum of its proper divisors (2726597817684).

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

1321986815136 is a wasteful number, since it uses less digits than its factorization.

1321986815136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353094798 (or 353094787 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 1321986815136 in words is "one trillion, three hundred twenty-one billion, nine hundred eighty-six million, eight hundred fifteen thousand, one hundred thirty-six".