23208121 has 4 divisors (see below), whose sum is σ = 23588644. Its totient is φ = 22827600.

The previous prime is 23208113. The next prime is 23208131. The reversal of 23208121 is 12180232.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9369721 + 13838400 = 3061^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 23208121 - 2³ = 23208113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23208131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190170 + ... + 190291.

It is an arithmetic number, because the mean of its divisors is an integer number (5897161).

Almost surely, 2^23208121 is an apocalyptic number.

It is an amenable number.

23208121 is a deficient number, since it is larger than the sum of its proper divisors (380523).

23208121 is an equidigital number, since it uses as much as digits as its factorization.

23208121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380522.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 23208121 is about 4817.4807731843. The cubic root of 23208121 is about 285.2419039842.

Adding to 23208121 its reverse (12180232), we get a palindrome (35388353).

The spelling of 23208121 in words is "twenty-three million, two hundred eight thousand, one hundred twenty-one".