23005621 has 2 divisors, whose sum is σ = 23005622. Its totient is φ = 23005620.

The previous prime is 23005597. The next prime is 23005639. The reversal of 23005621 is 12650032.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 5948721 = 4130^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 23005621 - 2⁹ = 23005109 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 (23005121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11502810 + 11502811.

It is an arithmetic number, because the mean of its divisors is an integer number (11502811).

Almost surely, 2^23005621 is an apocalyptic number.

It is an amenable number.

23005621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23005621 is an equidigital number, since it uses as much as digits as its factorization.

23005621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 23005621 is about 4796.4175172727. The cubic root of 23005621 is about 284.4098633101.

Adding to 23005621 its reverse (12650032), we get a palindrome (35655653).

It can be divided in two parts, 2300 and 5621, that added together give a square (7921 = 89²).

The spelling of 23005621 in words is "twenty-three million, five thousand, six hundred twenty-one".