22151251 has 4 divisors (see below), whose sum is σ = 22188352. Its totient is φ = 22114152.

The previous prime is 22151249. The next prime is 22151257. The reversal of 22151251 is 15215122.

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 22151251 - 2¹ = 22151249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22151257) 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, 17640 + ... + 18853.

It is an arithmetic number, because the mean of its divisors is an integer number (5547088).

Almost surely, 2^22151251 is an apocalyptic number.

22151251 is a deficient number, since it is larger than the sum of its proper divisors (37101).

22151251 is an equidigital number, since it uses as much as digits as its factorization.

22151251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37100.

The product of its digits is 200, while the sum is 19.

The square root of 22151251 is about 4706.5115531570. The cubic root of 22151251 is about 280.8446053428.

Adding to 22151251 its reverse (15215122), we get a palindrome (37366373).

The spelling of 22151251 in words is "twenty-two million, one hundred fifty-one thousand, two hundred fifty-one".