23216921641 has 9 divisors (see below), whose sum is σ = 24665710231. Its totient is φ = 21848782432.

The previous prime is 23216921633. The next prime is 23216921659. The reversal of 23216921641 is 14612961232.

It is a happy number.

The square root of 23216921641 is 152371.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18075458025 + 5141463616 = 134445^2 + 71704^2 .

It is not a de Polignac number, because 23216921641 - 2³ = 23216921633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23216921641.

It is not an unprimeable number, because it can be changed into a prime (23216921681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2585826 + ... + 2594788.

Almost surely, 2^23216921641 is an apocalyptic number.

23216921641 is the 152371-st square number.

23216921641 is the 76186-th centered octagonal number.

It is an amenable number.

23216921641 is a deficient number, since it is larger than the sum of its proper divisors (1448788590).

23216921641 is an frugal number, since it uses more digits than its factorization.

23216921641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17960 (or 8980 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The spelling of 23216921641 in words is "twenty-three billion, two hundred sixteen million, nine hundred twenty-one thousand, six hundred forty-one".