1321389904608 has 72 divisors (see below), whose sum is σ = 3758873253408. Its totient is φ = 440326075392.

The previous prime is 1321389904579. The next prime is 1321389904619. The reversal of 1321389904608 is 8064099831231.

1321389904608 is a `hidden beast` number, since 1 + 3 + 2 + 13 + 89 + 90 + 460 + 8 = 666.

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

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, 213385 + ... + 1639607.

It is an arithmetic number, because the mean of its divisors is an integer number (52206572964).

Almost surely, 2^{1321389904608} is an apocalyptic number.

1321389904608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1321389904608 is an abundant number, since it is smaller than the sum of its proper divisors (2437483348800).

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

1321389904608 is a wasteful number, since it uses less digits than its factorization.

1321389904608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429456 (or 1429445 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 1321389904608 in words is "one trillion, three hundred twenty-one billion, three hundred eighty-nine million, nine hundred four thousand, six hundred eight".