23531244021 has 12 divisors (see below), whose sum is σ = 34818589260. Its totient is φ = 15304873920.

The previous prime is 23531243993. The next prime is 23531244029. The reversal of 23531244021 is 12044213532.

23531244021 is a `hidden beast` number, since 235 + 3 + 1 + 24 + 402 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8979647121 + 14551596900 = 94761^2 + 120630^2 .

It is not a de Polignac number, because 23531244021 - 2³⁴ = 6351374837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531244029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31884786 + ... + 31885523.

It is an arithmetic number, because the mean of its divisors is an integer number (2901549105).

Almost surely, 2^23531244021 is an apocalyptic number.

It is an amenable number.

23531244021 is a deficient number, since it is larger than the sum of its proper divisors (11287345239).

23531244021 is a wasteful number, since it uses less digits than its factorization.

23531244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63770356 (or 63770353 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 23531244021 its reverse (12044213532), we get a palindrome (35575457553).

The spelling of 23531244021 in words is "twenty-three billion, five hundred thirty-one million, two hundred forty-four thousand, twenty-one".