21807252363 has 16 divisors (see below), whose sum is σ = 32159276576. Its totient is φ = 13057148160.

The previous prime is 21807252359. The next prime is 21807252403. The reversal of 21807252363 is 36325270812.

It is not a de Polignac number, because 21807252363 - 2² = 21807252359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21807252353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7554778 + ... + 7557663.

It is an arithmetic number, because the mean of its divisors is an integer number (2009954786).

Almost surely, 2^21807252363 is an apocalyptic number.

21807252363 is a deficient number, since it is larger than the sum of its proper divisors (10352024213).

21807252363 is a wasteful number, since it uses less digits than its factorization.

21807252363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15112494.

The product of its (nonzero) digits is 120960, while the sum is 39.

It can be divided in two parts, 21807 and 252363, that added together give a triangular number (274170 = T₇₄₀).

The spelling of 21807252363 in words is "twenty-one billion, eight hundred seven million, two hundred fifty-two thousand, three hundred sixty-three".