23120221 has 16 divisors (see below), whose sum is σ = 26438400. Its totient is φ = 20086528.

The previous prime is 23120191. The next prime is 23120249. The reversal of 23120221 is 12202132.

It is a cyclic number.

It is not a de Polignac number, because 23120221 - 2⁵ = 23120189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10320 + ... + 12358.

It is an arithmetic number, because the mean of its divisors is an integer number (1652400).

Almost surely, 2^23120221 is an apocalyptic number.

It is an amenable number.

23120221 is a deficient number, since it is larger than the sum of its proper divisors (3318179).

23120221 is a wasteful number, since it uses less digits than its factorization.

23120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 23120221 is about 4808.3490929840. The cubic root of 23120221 is about 284.8813335870.

Adding to 23120221 its reverse (12202132), we get a palindrome (35322353).

The spelling of 23120221 in words is "twenty-three million, one hundred twenty thousand, two hundred twenty-one".