23237648721 has 135 divisors (see below), whose sum is σ = 42289366353. Its totient is φ = 12292680960.

The previous prime is 23237648713. The next prime is 23237648741. The reversal of 23237648721 is 12784673232.

The square root of 23237648721 is 152439.

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

23237648721 is a `hidden beast` number, since 232 + 376 + 48 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2144153025 + 21093495696 = 46305^2 + 145236^2 .

It is not a de Polignac number, because 23237648721 - 2³ = 23237648713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23237648741) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 380945031 + ... + 380945091.

Almost surely, 2^23237648721 is an apocalyptic number.

23237648721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23237648721 is the 152439-th square number.

23237648721 is the 76220-th centered octagonal number.

It is an amenable number.

23237648721 is a deficient number, since it is larger than the sum of its proper divisors (19051717632).

23237648721 is an frugal number, since it uses more digits than its factorization.

23237648721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 88 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The spelling of 23237648721 in words is "twenty-three billion, two hundred thirty-seven million, six hundred forty-eight thousand, seven hundred twenty-one".