23436521 has 2 divisors, whose sum is σ = 23436522. Its totient is φ = 23436520.

The previous prime is 23436509. The next prime is 23436551. The reversal of 23436521 is 12563432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 1860496 = 4645^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 23436521 - 2¹⁰ = 23435497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (23436551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11718260 + 11718261.

It is an arithmetic number, because the mean of its divisors is an integer number (11718261).

Almost surely, 2^23436521 is an apocalyptic number.

It is an amenable number.

23436521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23436521 is an equidigital number, since it uses as much as digits as its factorization.

23436521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 26.

The square root of 23436521 is about 4841.1280710182. The cubic root of 23436521 is about 286.1745759598.

Adding to 23436521 its reverse (12563432), we get a palindrome (35999953).

The spelling of 23436521 in words is "twenty-three million, four hundred thirty-six thousand, five hundred twenty-one".