23872121 has 8 divisors (see below), whose sum is σ = 29381184. Its totient is φ = 18887760.

The previous prime is 23872111. The next prime is 23872129. The reversal of 23872121 is 12127832.

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 23872121 - 2¹⁰ = 23871097 is a prime.

It is a super-2 number, since 2×23872121² = 1139756322077282, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23872129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131075 + ... + 131256.

It is an arithmetic number, because the mean of its divisors is an integer number (3672648).

Almost surely, 2^23872121 is an apocalyptic number.

It is an amenable number.

23872121 is a deficient number, since it is larger than the sum of its proper divisors (5509063).

23872121 is a wasteful number, since it uses less digits than its factorization.

23872121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262351.

The product of its digits is 1344, while the sum is 26.

The square root of 23872121 is about 4885.9104576322. The cubic root of 23872121 is about 287.9366863458.

Adding to 23872121 its reverse (12127832), we get a palindrome (35999953).

The spelling of 23872121 in words is "twenty-three million, eight hundred seventy-two thousand, one hundred twenty-one".