23644421 has 2 divisors, whose sum is σ = 23644422. Its totient is φ = 23644420.

The previous prime is 23644409. The next prime is 23644447. The reversal of 23644421 is 12444632.

It is an a-pointer prime, because the next prime (23644447) can be obtained adding 23644421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15888196 + 7756225 = 3986^2 + 2785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23644421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23644121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11822210 + 11822211.

It is an arithmetic number, because the mean of its divisors is an integer number (11822211).

Almost surely, 2^23644421 is an apocalyptic number.

It is an amenable number.

23644421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23644421 is an equidigital number, since it uses as much as digits as its factorization.

23644421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 26.

The square root of 23644421 is about 4862.5529303032. The cubic root of 23644421 is about 287.0182824129.

The spelling of 23644421 in words is "twenty-three million, six hundred forty-four thousand, four hundred twenty-one".