921398806013 has 8 divisors (see below), whose sum is σ = 1053048512832. Its totient is φ = 789754425696.

The previous prime is 921398805989. The next prime is 921398806033. The reversal of 921398806013 is 310608893129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 921398806013 - 2⁶ = 921398805949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921398806033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953795 + ... + 1659072.

It is an arithmetic number, because the mean of its divisors is an integer number (131631064104).

Almost surely, 2^921398806013 is an apocalyptic number.

It is an amenable number.

921398806013 is a deficient number, since it is larger than the sum of its proper divisors (131649706819).

921398806013 is a wasteful number, since it uses less digits than its factorization.

921398806013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663251.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 921398806013 in words is "nine hundred twenty-one billion, three hundred ninety-eight million, eight hundred six thousand, thirteen".