4636520021 has 32 divisors (see below), whose sum is σ = 5726730240. Its totient is φ = 3667777344.

The previous prime is 4636520017. The next prime is 4636520027. The reversal of 4636520021 is 1200256364.

It is not a de Polignac number, because 4636520021 - 2² = 4636520017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4636520027) 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 31 ways as a sum of consecutive naturals, for example, 570575 + ... + 578643.

It is an arithmetic number, because the mean of its divisors is an integer number (178960320).

Almost surely, 2^4636520021 is an apocalyptic number.

It is an amenable number.

4636520021 is a deficient number, since it is larger than the sum of its proper divisors (1090210219).

4636520021 is a wasteful number, since it uses less digits than its factorization.

4636520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8225.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 4636520021 is about 68091.9967470480. The cubic root of 4636520021 is about 1667.4931037644.

Adding to 4636520021 its reverse (1200256364), we get a palindrome (5836776385).

The spelling of 4636520021 in words is "four billion, six hundred thirty-six million, five hundred twenty thousand, twenty-one".