23443121 has 4 divisors (see below), whose sum is σ = 25246452. Its totient is φ = 21639792.

The previous prime is 23443111. The next prime is 23443129. The reversal of 23443121 is 12134432.

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 10010896 + 13432225 = 3164^2 + 3665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23443121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23443093 and 23443102.

It is not an unprimeable number, because it can be changed into a prime (23443129) 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, 901646 + ... + 901671.

It is an arithmetic number, because the mean of its divisors is an integer number (6311613).

Almost surely, 2^23443121 is an apocalyptic number.

It is an amenable number.

23443121 is a deficient number, since it is larger than the sum of its proper divisors (1803331).

23443121 is a wasteful number, since it uses less digits than its factorization.

23443121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803330.

The product of its digits is 576, while the sum is 20.

The square root of 23443121 is about 4841.8096823399. The cubic root of 23443121 is about 286.2014368141.

Adding to 23443121 its reverse (12134432), we get a palindrome (35577553).

The spelling of 23443121 in words is "twenty-three million, four hundred forty-three thousand, one hundred twenty-one".