23121131 has 8 divisors (see below), whose sum is σ = 25469184. Its totient is φ = 20814120.

The previous prime is 23121127. The next prime is 23121181. The reversal of 23121131 is 13112132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23121131 - 2² = 23121127 is a prime.

It is a super-2 number, since 2×23121131² = 1069173397438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9071 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (3183648).

Almost surely, 2^23121131 is an apocalyptic number.

23121131 is a deficient number, since it is larger than the sum of its proper divisors (2348053).

23121131 is a wasteful number, since it uses less digits than its factorization.

23121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20521.

The product of its digits is 36, while the sum is 14.

The square root of 23121131 is about 4808.4437191258. The cubic root of 23121131 is about 284.8850711322.

Adding to 23121131 its reverse (13112132), we get a palindrome (36233263).

It can be divided in two parts, 2312 and 1131, that added together give a palindrome (3443).

The spelling of 23121131 in words is "twenty-three million, one hundred twenty-one thousand, one hundred thirty-one".