23130521 has 2 divisors, whose sum is σ = 23130522. Its totient is φ = 23130520.

The previous prime is 23130509. The next prime is 23130553. The reversal of 23130521 is 12503132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 672400 = 4739^2 + 820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23130521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23130521.

It is not a weakly prime, because it can be changed into another prime (23132521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565260 + 11565261.

It is an arithmetic number, because the mean of its divisors is an integer number (11565261).

Almost surely, 2^23130521 is an apocalyptic number.

It is an amenable number.

23130521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23130521 is an equidigital number, since it uses as much as digits as its factorization.

23130521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 23130521 is about 4809.4200274046. The cubic root of 23130521 is about 284.9236319443.

Adding to 23130521 its reverse (12503132), we get a palindrome (35633653).

The spelling of 23130521 in words is "twenty-three million, one hundred thirty thousand, five hundred twenty-one".