721126039922 has 6 divisors (see below), whose sum is σ = 1081690861293. Its totient is φ = 360562419492.

The previous prime is 721126039891. The next prime is 721126039943. The reversal of 721126039922 is 229930621127.

It can be written as a sum of positive squares in 2 ways, for example, as 517408314721 + 203717725201 = 719311^2 + 451351^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=600469.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 900704 + ... + 1501172.

Almost surely, 2^721126039922 is an apocalyptic number.

721126039922 is a deficient number, since it is larger than the sum of its proper divisors (360564821371).

721126039922 is an frugal number, since it uses more digits than its factorization.

721126039922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200940 (or 600471 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 721126039922 in words is "seven hundred twenty-one billion, one hundred twenty-six million, thirty-nine thousand, nine hundred twenty-two".