5636350021 has 4 divisors (see below), whose sum is σ = 5636550700. Its totient is φ = 5636149344.

The previous prime is 5636350007. The next prime is 5636350039. The reversal of 5636350021 is 1200536365.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3881913025 + 1754436996 = 62305^2 + 41886^2 .

It is a cyclic number.

It is not a de Polignac number, because 5636350021 - 2⁵ = 5636349989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5636350061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49686 + ... + 117223.

It is an arithmetic number, because the mean of its divisors is an integer number (1409137675).

Almost surely, 2^5636350021 is an apocalyptic number.

It is an amenable number.

5636350021 is a deficient number, since it is larger than the sum of its proper divisors (200679).

5636350021 is a wasteful number, since it uses less digits than its factorization.

5636350021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200678.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 5636350021 is about 75075.6286753564. The cubic root of 5636350021 is about 1779.6420208654.

Adding to 5636350021 its reverse (1200536365), we get a palindrome (6836886386).

The spelling of 5636350021 in words is "five billion, six hundred thirty-six million, three hundred fifty thousand, twenty-one".