23424421581 has 18 divisors (see below), whose sum is σ = 37190841870. Its totient is φ = 14196618480.

The previous prime is 23424421577. The next prime is 23424421583. The reversal of 23424421581 is 18512442432.

23424421581 is a `hidden beast` number, since 2 + 34 + 2 + 4 + 42 + 1 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21371516100 + 2052905481 = 146190^2 + 45309^2 .

It is not a de Polignac number, because 23424421581 - 2² = 23424421577 is a prime.

It is a super-2 number, since 2×23424421581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23424421583) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10753926 + ... + 10756103.

Almost surely, 2^23424421581 is an apocalyptic number.

It is an amenable number.

23424421581 is a deficient number, since it is larger than the sum of its proper divisors (13766420289).

23424421581 is a wasteful number, since it uses less digits than its factorization.

23424421581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21510057 (or 21510043 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The spelling of 23424421581 in words is "twenty-three billion, four hundred twenty-four million, four hundred twenty-one thousand, five hundred eighty-one".