22251251 has 4 divisors (see below), whose sum is σ = 24274104. Its totient is φ = 20228400.

The previous prime is 22251239. The next prime is 22251263. The reversal of 22251251 is 15215222.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (22251239) and next prime (22251263).

It is a cyclic number.

It is not a de Polignac number, because 22251251 - 2¹⁰ = 22250227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22251751) 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, 1011410 + ... + 1011431.

It is an arithmetic number, because the mean of its divisors is an integer number (6068526).

Almost surely, 2^22251251 is an apocalyptic number.

22251251 is a deficient number, since it is larger than the sum of its proper divisors (2022853).

22251251 is a wasteful number, since it uses less digits than its factorization.

22251251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022852.

The product of its digits is 400, while the sum is 20.

The square root of 22251251 is about 4717.1231698992. The cubic root of 22251251 is about 281.2665875978.

Adding to 22251251 its reverse (15215222), we get a palindrome (37466473).

The spelling of 22251251 in words is "twenty-two million, two hundred fifty-one thousand, two hundred fifty-one".