23155121 has 16 divisors (see below), whose sum is σ = 25878528. Its totient is φ = 20542800.

The previous prime is 23155063. The next prime is 23155123. The reversal of 23155121 is 12155132.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23155121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23155093 and 23155102.

It is not an unprimeable number, because it can be changed into a prime (23155123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121136 + ... + 121326.

It is an arithmetic number, because the mean of its divisors is an integer number (1617408).

Almost surely, 2^23155121 is an apocalyptic number.

It is an amenable number.

23155121 is a deficient number, since it is larger than the sum of its proper divisors (2723407).

23155121 is a wasteful number, since it uses less digits than its factorization.

23155121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 300, while the sum is 20.

The square root of 23155121 is about 4811.9768287056. The cubic root of 23155121 is about 285.0246044214.

The spelling of 23155121 in words is "twenty-three million, one hundred fifty-five thousand, one hundred twenty-one".