23121564 has 24 divisors (see below), whose sum is σ = 57124368. Its totient is φ = 7253760.

The previous prime is 23121557. The next prime is 23121583. The reversal of 23121564 is 46512132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56467 + ... + 56874.

It is an arithmetic number, because the mean of its divisors is an integer number (2380182).

Almost surely, 2^23121564 is an apocalyptic number.

It is an amenable number.

23121564 is an abundant number, since it is smaller than the sum of its proper divisors (34002804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23121564 is a wasteful number, since it uses less digits than its factorization.

23121564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113365 (or 113363 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 23121564 is about 4808.4887438779. The cubic root of 23121564 is about 284.8868495121.

Adding to 23121564 its reverse (46512132), we get a palindrome (69633696).

It can be divided in two parts, 23 and 121564, that multiplied together give a palindrome (2795972).

The spelling of 23121564 in words is "twenty-three million, one hundred twenty-one thousand, five hundred sixty-four".