636363021 has 8 divisors (see below), whose sum is σ = 969696064. Its totient is φ = 363636000.

The previous prime is 636363001. The next prime is 636363043. The reversal of 636363021 is 120363636.

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

It is not a de Polignac number, because 636363021 - 2⁹ = 636362509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 636363021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636363001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15151480 + ... + 15151521.

It is an arithmetic number, because the mean of its divisors is an integer number (121212008).

Almost surely, 2^636363021 is an apocalyptic number.

It is an amenable number.

636363021 is a deficient number, since it is larger than the sum of its proper divisors (333333043).

636363021 is a wasteful number, since it uses less digits than its factorization.

636363021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30303011.

The product of its (nonzero) digits is 11664, while the sum is 30.

The square root of 636363021 is about 25226.2367585813. The cubic root of 636363021 is about 860.1383502858.

The spelling of 636363021 in words is "six hundred thirty-six million, three hundred sixty-three thousand, twenty-one".