21652700513 has 4 divisors (see below), whose sum is σ = 21656793540. Its totient is φ = 21648607488.

The previous prime is 21652700501. The next prime is 21652700557. The reversal of 21652700513 is 31500725612.

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 16708923169 + 4943777344 = 129263^2 + 70312^2 .

It is a cyclic number.

It is not a de Polignac number, because 21652700513 - 2⁴ = 21652700497 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 21652700513.

It is not an unprimeable number, because it can be changed into a prime (21652700213) 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, 2038568 + ... + 2049161.

It is an arithmetic number, because the mean of its divisors is an integer number (5414198385).

Almost surely, 2^21652700513 is an apocalyptic number.

It is an amenable number.

21652700513 is a deficient number, since it is larger than the sum of its proper divisors (4093027).

21652700513 is an equidigital number, since it uses as much as digits as its factorization.

21652700513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093026.

The product of its (nonzero) digits is 12600, while the sum is 32.

The spelling of 21652700513 in words is "twenty-one billion, six hundred fifty-two million, seven hundred thousand, five hundred thirteen".