23653571021 has 8 divisors (see below), whose sum is σ = 24216825600. Its totient is φ = 23103410316.

The previous prime is 23653571017. The next prime is 23653571083. The reversal of 23653571021 is 12017535632.

It is not a de Polignac number, because 23653571021 - 2² = 23653571017 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 (23653570021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69245 + ... + 228258.

It is an arithmetic number, because the mean of its divisors is an integer number (3027103200).

Almost surely, 2^23653571021 is an apocalyptic number.

It is an amenable number.

23653571021 is a deficient number, since it is larger than the sum of its proper divisors (563254579).

23653571021 is an frugal number, since it uses more digits than its factorization.

23653571021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297632 (or 297546 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 23653571021 in words is "twenty-three billion, six hundred fifty-three million, five hundred seventy-one thousand, twenty-one".