722086021 has 2 divisors, whose sum is σ = 722086022. Its totient is φ = 722086020.

The previous prime is 722086009. The next prime is 722086031. The reversal of 722086021 is 120680227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538889796 + 183196225 = 23214^2 + 13535^2 .

It is a cyclic number.

It is not a de Polignac number, because 722086021 - 2⁷ = 722085893 is a prime.

It is a super-2 number, since 2×722086021² = 1042816443447224882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722086031) 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 as a sum of consecutive naturals, namely, 361043010 + 361043011.

It is an arithmetic number, because the mean of its divisors is an integer number (361043011).

Almost surely, 2^722086021 is an apocalyptic number.

It is an amenable number.

722086021 is a deficient number, since it is larger than the sum of its proper divisors (1).

722086021 is an equidigital number, since it uses as much as digits as its factorization.

722086021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 722086021 is about 26871.6583224780. The cubic root of 722086021 is about 897.1456984582.

The spelling of 722086021 in words is "seven hundred twenty-two million, eighty-six thousand, twenty-one".