722011921 has 8 divisors (see below), whose sum is σ = 734328000. Its totient is φ = 709711440.

The previous prime is 722011907. The next prime is 722011931. The reversal of 722011921 is 129110227.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722011921 is a prime.

It is a super-2 number, since 2×722011921² = 1042602428132220482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722011931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125220 + ... + 130858.

It is an arithmetic number, because the mean of its divisors is an integer number (91791000).

Almost surely, 2^722011921 is an apocalyptic number.

It is an amenable number.

722011921 is a deficient number, since it is larger than the sum of its proper divisors (12316079).

722011921 is a wasteful number, since it uses less digits than its factorization.

722011921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7799.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 722011921 is about 26870.2795110137. The cubic root of 722011921 is about 897.1150092381.

The spelling of 722011921 in words is "seven hundred twenty-two million, eleven thousand, nine hundred twenty-one".