23421161 has 4 divisors (see below), whose sum is σ = 23578500. Its totient is φ = 23263824.

The previous prime is 23421149. The next prime is 23421169. The reversal of 23421161 is 16112432.

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 6864400 + 16556761 = 2620^2 + 4069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23421161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23421169) 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, 78446 + ... + 78743.

It is an arithmetic number, because the mean of its divisors is an integer number (5894625).

Almost surely, 2^23421161 is an apocalyptic number.

It is an amenable number.

23421161 is a deficient number, since it is larger than the sum of its proper divisors (157339).

23421161 is a wasteful number, since it uses less digits than its factorization.

23421161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157338.

The product of its digits is 288, while the sum is 20.

The square root of 23421161 is about 4839.5414038936. The cubic root of 23421161 is about 286.1120438954.

Adding to 23421161 its reverse (16112432), we get a palindrome (39533593).

The spelling of 23421161 in words is "twenty-three million, four hundred twenty-one thousand, one hundred sixty-one".