22155251 has 4 divisors (see below), whose sum is σ = 22185504. Its totient is φ = 22125000.

The previous prime is 22155247. The next prime is 22155253. The reversal of 22155251 is 15255122.

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 22155251 - 2² = 22155247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22155253) 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, 14000 + ... + 15501.

It is an arithmetic number, because the mean of its divisors is an integer number (5546376).

Almost surely, 2^22155251 is an apocalyptic number.

22155251 is a deficient number, since it is larger than the sum of its proper divisors (30253).

22155251 is an equidigital number, since it uses as much as digits as its factorization.

22155251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30252.

The product of its digits is 1000, while the sum is 23.

The square root of 22155251 is about 4706.9364771579. The cubic root of 22155251 is about 280.8615089902.

The spelling of 22155251 in words is "twenty-two million, one hundred fifty-five thousand, two hundred fifty-one".