23180621 has 4 divisors (see below), whose sum is σ = 23746044. Its totient is φ = 22615200.

The previous prime is 23180617. The next prime is 23180623. The reversal of 23180621 is 12608132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 722500 + 22458121 = 850^2 + 4739^2 .

It is a cyclic number.

It is not a de Polignac number, because 23180621 - 2² = 23180617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23180623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282650 + ... + 282731.

It is an arithmetic number, because the mean of its divisors is an integer number (5936511).

Almost surely, 2^23180621 is an apocalyptic number.

It is an amenable number.

23180621 is a deficient number, since it is larger than the sum of its proper divisors (565423).

23180621 is an equidigital number, since it uses as much as digits as its factorization.

23180621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565422.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 23180621 is about 4814.6257383103. The cubic root of 23180621 is about 285.1291955540.

Adding to 23180621 its reverse (12608132), we get a palindrome (35788753).

The spelling of 23180621 in words is "twenty-three million, one hundred eighty thousand, six hundred twenty-one".