1321380430920 has 128 divisors (see below), whose sum is σ = 4805019792000. Its totient is φ = 320334647040.

The previous prime is 1321380430919. The next prime is 1321380430927. The reversal of 1321380430920 is 290340831231.

1321380430920 is a `hidden beast` number, since 1 + 3 + 2 + 138 + 0 + 430 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1321380430927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55601775 + ... + 55625534.

It is an arithmetic number, because the mean of its divisors is an integer number (37539217125).

Almost surely, 2^{1321380430920} is an apocalyptic number.

1321380430920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321380430920 is an abundant number, since it is smaller than the sum of its proper divisors (3483639361080).

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

1321380430920 is a wasteful number, since it uses less digits than its factorization.

1321380430920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111227340 (or 111227330 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 1321380430920 in words is "one trillion, three hundred twenty-one billion, three hundred eighty million, four hundred thirty thousand, nine hundred twenty".