23121138 has 16 divisors (see below), whose sum is σ = 48676320. Its totient is φ = 7301376.

The previous prime is 23121127. The next prime is 23121181. The reversal of 23121138 is 83112132.

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, 101295 + ... + 101522.

It is an arithmetic number, because the mean of its divisors is an integer number (3042270).

Almost surely, 2^23121138 is an apocalyptic number.

23121138 is an abundant number, since it is smaller than the sum of its proper divisors (25555182).

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

23121138 is a wasteful number, since it uses less digits than its factorization.

23121138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202841.

The product of its digits is 288, while the sum is 21.

The square root of 23121138 is about 4808.4444470119. Note that the first 5 decimals coincide. The cubic root of 23121138 is about 284.8850998821.

The spelling of 23121138 in words is "twenty-three million, one hundred twenty-one thousand, one hundred thirty-eight".