23121387 has 12 divisors (see below), whose sum is σ = 33604584. Its totient is φ = 15318720.

The previous prime is 23121361. The next prime is 23121389. The reversal of 23121387 is 78312132.

It is not a de Polignac number, because 23121387 - 2²⁰ = 22072811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23121387.

It is not an unprimeable number, because it can be changed into a prime (23121389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6414 + ... + 9347.

It is an arithmetic number, because the mean of its divisors is an integer number (2800382).

Almost surely, 2^23121387 is an apocalyptic number.

23121387 is a deficient number, since it is larger than the sum of its proper divisors (10483197).

23121387 is a wasteful number, since it uses less digits than its factorization.

23121387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15930 (or 15927 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 23121387 is about 4808.4703388916. The cubic root of 23121387 is about 284.8861225558.

The spelling of 23121387 in words is "twenty-three million, one hundred twenty-one thousand, three hundred eighty-seven".