722777021 has 2 divisors, whose sum is σ = 722777022. Its totient is φ = 722777020.

The previous prime is 722776961. The next prime is 722777113. The reversal of 722777021 is 120777227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630712996 + 92064025 = 25114^2 + 9595^2 .

It is a cyclic number.

It is not a de Polignac number, because 722777021 - 2¹⁰ = 722775997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722777521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361388510 + 361388511.

It is an arithmetic number, because the mean of its divisors is an integer number (361388511).

Almost surely, 2^722777021 is an apocalyptic number.

It is an amenable number.

722777021 is a deficient number, since it is larger than the sum of its proper divisors (1).

722777021 is an equidigital number, since it uses as much as digits as its factorization.

722777021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 722777021 is about 26884.5126606379. The cubic root of 722777021 is about 897.4317816570.

It can be divided in two parts, 7227 and 77021, that added together give a palindrome (84248).

The spelling of 722777021 in words is "seven hundred twenty-two million, seven hundred seventy-seven thousand, twenty-one".