721213981904 has 40 divisors (see below), whose sum is σ = 1570268579712. Its totient is φ = 318395468160.

The previous prime is 721213981861. The next prime is 721213981919. The reversal of 721213981904 is 409189312127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75372932 + ... + 75382499.

Almost surely, 2^721213981904 is an apocalyptic number.

It is an amenable number.

721213981904 is an abundant number, since it is smaller than the sum of its proper divisors (849054597808).

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

721213981904 is a wasteful number, since it uses less digits than its factorization.

721213981904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150755475 (or 150755469 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 721213981904 in words is "seven hundred twenty-one billion, two hundred thirteen million, nine hundred eighty-one thousand, nine hundred four".