23651266561221 has 16 divisors (see below), whose sum is σ = 34136755679936. Its totient is φ = 14479213003776.

The previous prime is 23651266561217. The next prime is 23651266561249. The reversal of 23651266561221 is 12216566215632.

It is not a de Polignac number, because 23651266561221 - 2² = 23651266561217 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23651266562221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1571087635 + ... + 1571102688.

It is an arithmetic number, because the mean of its divisors is an integer number (2133547229996).

Almost surely, 2^{23651266561221} is an apocalyptic number.

It is an amenable number.

23651266561221 is a deficient number, since it is larger than the sum of its proper divisors (10485489118715).

23651266561221 is a wasteful number, since it uses less digits than its factorization.

23651266561221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142190532.

The product of its digits is 1555200, while the sum is 48.

The spelling of 23651266561221 in words is "twenty-three trillion, six hundred fifty-one billion, two hundred sixty-six million, five hundred sixty-one thousand, two hundred twenty-one".