23811884721 has 9 divisors (see below), whose sum is σ = 34395613291. Its totient is φ = 15874281192.

The previous prime is 23811884711. The next prime is 23811884771. The reversal of 23811884721 is 12748811832.

The square root of 23811884721 is 154311.

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

23811884721 is a `hidden beast` number, since 23 + 81 + 1 + 88 + 472 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23148101025 + 663783696 = 152145^2 + 25764^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 23811884721 - 2⁵ = 23811884689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23811884711) 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, 437215 + ... + 488651.

Almost surely, 2^23811884721 is an apocalyptic number.

23811884721 is the 154311-st square number.

23811884721 is the 77156-th centered octagonal number.

It is an amenable number.

23811884721 is a deficient number, since it is larger than the sum of its proper divisors (10583728570).

23811884721 is an frugal number, since it uses more digits than its factorization.

23811884721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102880 (or 51440 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The spelling of 23811884721 in words is "twenty-three billion, eight hundred eleven million, eight hundred eighty-four thousand, seven hundred twenty-one".