1321187251536 has 80 divisors (see below), whose sum is σ = 3798423998400. Its totient is φ = 439684198272.

The previous prime is 1321187251481. The next prime is 1321187251541. The reversal of 1321187251536 is 6351527811231.

1321187251536 is a `hidden beast` number, since 1 + 3 + 2 + 11 + 87 + 25 + 1 + 536 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1321187251491 and 1321187251500.

It is a congruent number.

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, 2202951 + ... + 2737766.

It is an arithmetic number, because the mean of its divisors is an integer number (47480299980).

Almost surely, 2^{1321187251536} is an apocalyptic number.

1321187251536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321187251536 is an abundant number, since it is smaller than the sum of its proper divisors (2477236746864).

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

1321187251536 is a wasteful number, since it uses less digits than its factorization.

1321187251536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941353 (or 4941341 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 1321187251536 in words is "one trillion, three hundred twenty-one billion, one hundred eighty-seven million, two hundred fifty-one thousand, five hundred thirty-six".