722436021 has 6 divisors (see below), whose sum is σ = 1043518710. Its totient is φ = 481624008.

The previous prime is 722436019. The next prime is 722436037. The reversal of 722436021 is 120634227.

It can be written as a sum of positive squares in only one way, i.e., 606636900 + 115799121 = 24630^2 + 10761^2 .

It is not a de Polignac number, because 722436021 - 2¹ = 722436019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722436521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40135326 + ... + 40135343.

It is an arithmetic number, because the mean of its divisors is an integer number (173919785).

Almost surely, 2^722436021 is an apocalyptic number.

It is an amenable number.

722436021 is a deficient number, since it is larger than the sum of its proper divisors (321082689).

722436021 is a wasteful number, since it uses less digits than its factorization.

722436021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80270675 (or 80270672 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 722436021 is about 26878.1699711867. The cubic root of 722436021 is about 897.2906259166.

The spelling of 722436021 in words is "seven hundred twenty-two million, four hundred thirty-six thousand, twenty-one".