1321331238720 has 84 divisors (see below), whose sum is σ = 4544828916420. Its totient is φ = 352354996224.

The previous prime is 1321331238707. The next prime is 1321331238769. The reversal of 1321331238720 is 278321331231.

1321331238720 is a `hidden beast` number, since 1 + 3 + 21 + 331 + 238 + 72 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 507092106816 + 814239131904 = 712104^2 + 902352^2 .

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

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, 229394905 + ... + 229400664.

Almost surely, 2^{1321331238720} is an apocalyptic number.

1321331238720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321331238720 is an abundant number, since it is smaller than the sum of its proper divisors (3223497677700).

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

1321331238720 is a wasteful number, since it uses less digits than its factorization.

1321331238720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458795592 (or 458795579 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

Adding to 1321331238720 its reverse (278321331231), we get a palindrome (1599652569951).

The spelling of 1321331238720 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-one million, two hundred thirty-eight thousand, seven hundred twenty".