21634006923 has 6 divisors (see below), whose sum is σ = 31249121124. Its totient is φ = 14422671276.

The previous prime is 21634006871. The next prime is 21634006939. The reversal of 21634006923 is 32960043612.

21634006923 is a `hidden beast` number, since 2 + 163 + 400 + 6 + 92 + 3 = 666.

It is not a de Polignac number, because 21634006923 - 2²⁵ = 21600452491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21634006973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1201889265 + ... + 1201889282.

It is an arithmetic number, because the mean of its divisors is an integer number (5208186854).

Almost surely, 2^21634006923 is an apocalyptic number.

21634006923 is a deficient number, since it is larger than the sum of its proper divisors (9615114201).

21634006923 is a wasteful number, since it uses less digits than its factorization.

21634006923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403778553 (or 2403778550 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 21634006923 in words is "twenty-one billion, six hundred thirty-four million, six thousand, nine hundred twenty-three".