1321683318720 has 84 divisors (see below), whose sum is σ = 4546039924920. Its totient is φ = 352448884224.

The previous prime is 1321683318719. The next prime is 1321683318731. The reversal of 1321683318720 is 278133861231.

1321683318720 is a `hidden beast` number, since 1 + 3 + 216 + 8 + 331 + 87 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 229456030 + ... + 229461789.

Almost surely, 2^{1321683318720} is an apocalyptic number.

1321683318720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321683318720 is an abundant number, since it is smaller than the sum of its proper divisors (3224356606200).

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

1321683318720 is a wasteful number, since it uses less digits than its factorization.

1321683318720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458917842 (or 458917829 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 1321683318720 in words is "one trillion, three hundred twenty-one billion, six hundred eighty-three million, three hundred eighteen thousand, seven hundred twenty".