23220251 has 4 divisors (see below), whose sum is σ = 23247432. Its totient is φ = 23193072.

The previous prime is 23220247. The next prime is 23220259. The reversal of 23220251 is 15202232.

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

It is a cyclic number.

It is not a de Polignac number, because 23220251 - 2² = 23220247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23220259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12266 + ... + 14031.

It is an arithmetic number, because the mean of its divisors is an integer number (5811858).

Almost surely, 2^23220251 is an apocalyptic number.

23220251 is a deficient number, since it is larger than the sum of its proper divisors (27181).

23220251 is an equidigital number, since it uses as much as digits as its factorization.

23220251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27180.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 23220251 is about 4818.7395654881. The cubic root of 23220251 is about 285.2915903515.

Adding to 23220251 its reverse (15202232), we get a palindrome (38422483).

The spelling of 23220251 in words is "twenty-three million, two hundred twenty thousand, two hundred fifty-one".