22122251 has 24 divisors (see below), whose sum is σ = 25482240. Its totient is φ = 19126800.

The previous prime is 22122241. The next prime is 22122259. The reversal of 22122251 is 15222122.

It is a de Polignac number, because none of the positive numbers 2^k-22122251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22122259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311546 + ... + 311616.

It is an arithmetic number, because the mean of its divisors is an integer number (1061760).

Almost surely, 2^22122251 is an apocalyptic number.

22122251 is a deficient number, since it is larger than the sum of its proper divisors (3359989).

22122251 is a wasteful number, since it uses less digits than its factorization.

22122251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 144 counting only the distinct ones).

The product of its digits is 160, while the sum is 17.

The square root of 22122251 is about 4703.4297060762. The cubic root of 22122251 is about 280.7219929999.

Adding to 22122251 its reverse (15222122), we get a palindrome (37344373).

The spelling of 22122251 in words is "twenty-two million, one hundred twenty-two thousand, two hundred fifty-one".