363321721 has 15 divisors (see below), whose sum is σ = 424942511. Its totient is φ = 310618056.

The previous prime is 363321713. The next prime is 363321733. The reversal of 363321721 is 127123363.

The square root of 363321721 is 19061.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 85766121 + 277555600 = 9261^2 + 16660^2 .

It is not a de Polignac number, because 363321721 - 2³ = 363321713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 363321721.

It is not an unprimeable number, because it can be changed into a prime (363321701) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 933795 + ... + 934183.

Almost surely, 2^363321721 is an apocalyptic number.

363321721 is the 19061-st square number.

363321721 is the 9531-st centered octagonal number.

It is an amenable number.

363321721 is a deficient number, since it is larger than the sum of its proper divisors (61620790).

363321721 is an frugal number, since it uses more digits than its factorization.

363321721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 396 counting only the distinct ones).

The product of its digits is 4536, while the sum is 28.

The cubic root of 363321721 is about 713.5599300257.

The spelling of 363321721 in words is "three hundred sixty-three million, three hundred twenty-one thousand, seven hundred twenty-one".