23222521 has 6 divisors (see below), whose sum is σ = 27014010. Its totient is φ = 19904976.

The previous prime is 23222513. The next prime is 23222539. The reversal of 23222521 is 12522232.

It can be written as a sum of positive squares in only one way, i.e., 14288400 + 8934121 = 3780^2 + 2989^2 .

It is not a de Polignac number, because 23222521 - 2³ = 23222513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23222581) 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 5 ways as a sum of consecutive naturals, for example, 236916 + ... + 237013.

It is an arithmetic number, because the mean of its divisors is an integer number (4502335).

Almost surely, 2^23222521 is an apocalyptic number.

It is an amenable number.

23222521 is a deficient number, since it is larger than the sum of its proper divisors (3791489).

23222521 is an equidigital number, since it uses as much as digits as its factorization.

23222521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473943 (or 473936 counting only the distinct ones).

The product of its digits is 480, while the sum is 19.

The square root of 23222521 is about 4818.9750985038. The cubic root of 23222521 is about 285.3008867024.

Adding to 23222521 its reverse (12522232), we get a palindrome (35744753).

The spelling of 23222521 in words is "twenty-three million, two hundred twenty-two thousand, five hundred twenty-one".