21923153766 has 64 divisors (see below), whose sum is σ = 49222287360. Its totient is φ = 7232379840.

The previous prime is 21923153741. The next prime is 21923153767. The reversal of 21923153766 is 66735132912.

21923153766 is a `hidden beast` number, since 21 + 9 + 2 + 31 + 537 + 66 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21923153767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2952090 + ... + 2959506.

It is an arithmetic number, because the mean of its divisors is an integer number (769098240).

Almost surely, 2^21923153766 is an apocalyptic number.

21923153766 is an abundant number, since it is smaller than the sum of its proper divisors (27299133594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21923153766 is a wasteful number, since it uses less digits than its factorization.

21923153766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7986 (or 7980 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The spelling of 21923153766 in words is "twenty-one billion, nine hundred twenty-three million, one hundred fifty-three thousand, seven hundred sixty-six".