22272251 has 4 divisors (see below), whose sum is σ = 22318104. Its totient is φ = 22226400.

The previous prime is 22272241. The next prime is 22272253. The reversal of 22272251 is 15227222.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22272251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22272253) 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, 22190 + ... + 23171.

It is an arithmetic number, because the mean of its divisors is an integer number (5579526).

Almost surely, 2^22272251 is an apocalyptic number.

22272251 is a deficient number, since it is larger than the sum of its proper divisors (45853).

22272251 is an equidigital number, since it uses as much as digits as its factorization.

22272251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45852.

The product of its digits is 1120, while the sum is 23.

The square root of 22272251 is about 4719.3485779289. The cubic root of 22272251 is about 281.3550431662.

Adding to 22272251 its reverse (15227222), we get a palindrome (37499473).

The spelling of 22272251 in words is "twenty-two million, two hundred seventy-two thousand, two hundred fifty-one".