23443421 has 2 divisors, whose sum is σ = 23443422. Its totient is φ = 23443420.

The previous prime is 23443411. The next prime is 23443429. The reversal of 23443421 is 12434432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 10562500 = 3589^2 + 3250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23443421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23443429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11721710 + 11721711.

It is an arithmetic number, because the mean of its divisors is an integer number (11721711).

Almost surely, 2^23443421 is an apocalyptic number.

It is an amenable number.

23443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23443421 is an equidigital number, since it uses as much as digits as its factorization.

23443421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 23.

The square root of 23443421 is about 4841.8406623928. The cubic root of 23443421 is about 286.2026576422.

Adding to 23443421 its reverse (12434432), we get a palindrome (35877853).

The spelling of 23443421 in words is "twenty-three million, four hundred forty-three thousand, four hundred twenty-one".