23421537 has 12 divisors (see below), whose sum is σ = 34656804. Its totient is φ = 15233280.

The previous prime is 23421533. The next prime is 23421569. The reversal of 23421537 is 73512432.

It can be written as a sum of positive squares in 2 ways, for example, as 2954961 + 20466576 = 1719^2 + 4524^2 .

It is not a de Polignac number, because 23421537 - 2² = 23421533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23421537.

It is not an unprimeable number, because it can be changed into a prime (23421533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31368 + ... + 32105.

It is an arithmetic number, because the mean of its divisors is an integer number (2888067).

Almost surely, 2^23421537 is an apocalyptic number.

It is an amenable number.

23421537 is a deficient number, since it is larger than the sum of its proper divisors (11235267).

23421537 is a wasteful number, since it uses less digits than its factorization.

23421537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63520 (or 63517 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 23421537 is about 4839.5802503936. The cubic root of 23421537 is about 286.1135749546.

Adding to 23421537 its reverse (73512432), we get a palindrome (96933969).

The spelling of 23421537 in words is "twenty-three million, four hundred twenty-one thousand, five hundred thirty-seven".