21623368863 has 4 divisors (see below), whose sum is σ = 28831158488. Its totient is φ = 14415579240.

The previous prime is 21623368777. The next prime is 21623368867. The reversal of 21623368863 is 36886332612.

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

It is not a de Polignac number, because 21623368863 - 2¹⁶ = 21623303327 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 (21623368867) 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, 3603894808 + ... + 3603894813.

It is an arithmetic number, because the mean of its divisors is an integer number (7207789622).

Almost surely, 2^21623368863 is an apocalyptic number.

21623368863 is a deficient number, since it is larger than the sum of its proper divisors (7207789625).

21623368863 is an equidigital number, since it uses as much as digits as its factorization.

21623368863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7207789624.

The product of its digits is 1492992, while the sum is 48.

The spelling of 21623368863 in words is "twenty-one billion, six hundred twenty-three million, three hundred sixty-eight thousand, eight hundred sixty-three".