23918953221 has 12 divisors (see below), whose sum is σ = 34587703072. Its totient is φ = 15928382376.

The previous prime is 23918953217. The next prime is 23918953229. The reversal of 23918953221 is 12235981932.

23918953221 is a `hidden beast` number, since 2 + 3 + 91 + 8 + 9 + 532 + 21 = 666.

It is not a de Polignac number, because 23918953221 - 2² = 23918953217 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 (23918953229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1456921 + ... + 1473246.

Almost surely, 2^23918953221 is an apocalyptic number.

It is an amenable number.

23918953221 is a deficient number, since it is larger than the sum of its proper divisors (10668749851).

23918953221 is a wasteful number, since it uses less digits than its factorization.

23918953221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931080 (or 2931077 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 23918953221 in words is "twenty-three billion, nine hundred eighteen million, nine hundred fifty-three thousand, two hundred twenty-one".