23442421 has 4 divisors (see below), whose sum is σ = 23453100. Its totient is φ = 23431744.

The previous prime is 23442407. The next prime is 23442427. The reversal of 23442421 is 12424432.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9678321 + 13764100 = 3111^2 + 3710^2 .

It is a cyclic number.

It is not a de Polignac number, because 23442421 - 2⁹ = 23441909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23442392 and 23442401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23442427) 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, 706 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (5863275).

Almost surely, 2^23442421 is an apocalyptic number.

It is an amenable number.

23442421 is a deficient number, since it is larger than the sum of its proper divisors (10679).

23442421 is an equidigital number, since it uses as much as digits as its factorization.

23442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10678.

The product of its digits is 1536, while the sum is 22.

The square root of 23442421 is about 4841.7373947789. The cubic root of 23442421 is about 286.1985881746.

Adding to 23442421 its reverse (12424432), we get a palindrome (35866853).

The spelling of 23442421 in words is "twenty-three million, four hundred forty-two thousand, four hundred twenty-one".