21924923823 has 48 divisors (see below), whose sum is σ = 35275758336. Its totient is φ = 13010469120.

The previous prime is 21924923791. The next prime is 21924923843. The reversal of 21924923823 is 32832942912.

21924923823 is a `hidden beast` number, since 21 + 9 + 249 + 2 + 382 + 3 = 666.

It is not a de Polignac number, because 21924923823 - 2⁵ = 21924923791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924923843) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1097815 + ... + 1117607.

It is an arithmetic number, because the mean of its divisors is an integer number (734911632).

Almost surely, 2^21924923823 is an apocalyptic number.

21924923823 is a deficient number, since it is larger than the sum of its proper divisors (13350834513).

21924923823 is a wasteful number, since it uses less digits than its factorization.

21924923823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20044 (or 20041 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The spelling of 21924923823 in words is "twenty-one billion, nine hundred twenty-four million, nine hundred twenty-three thousand, eight hundred twenty-three".