636330200421 has 4 divisors (see below), whose sum is σ = 848440267232. Its totient is φ = 424220133612.

The previous prime is 636330200393. The next prime is 636330200447. The reversal of 636330200421 is 124002033636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 636330200421 - 2¹³ = 636330192229 is a prime.

It is a super-2 number, since 2×636330200421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636330200221) 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 in 3 ways as a sum of consecutive naturals, for example, 106055033401 + ... + 106055033406.

It is an arithmetic number, because the mean of its divisors is an integer number (212110066808).

Almost surely, 2^636330200421 is an apocalyptic number.

It is an amenable number.

636330200421 is a deficient number, since it is larger than the sum of its proper divisors (212110066811).

636330200421 is a wasteful number, since it uses less digits than its factorization.

636330200421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212110066810.

The product of its (nonzero) digits is 15552, while the sum is 30.

The spelling of 636330200421 in words is "six hundred thirty-six billion, three hundred thirty million, two hundred thousand, four hundred twenty-one".