22142251 has 4 divisors (see below), whose sum is σ = 22185112. Its totient is φ = 22099392.

The previous prime is 22142231. The next prime is 22142257. The reversal of 22142251 is 15224122.

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 22142251 - 2⁹ = 22141739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22142257) 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, 20646 + ... + 21691.

It is an arithmetic number, because the mean of its divisors is an integer number (5546278).

Almost surely, 2^22142251 is an apocalyptic number.

22142251 is a deficient number, since it is larger than the sum of its proper divisors (42861).

22142251 is an equidigital number, since it uses as much as digits as its factorization.

22142251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42860.

The product of its digits is 320, while the sum is 19.

The square root of 22142251 is about 4705.5553338581. Note that the first 3 decimals coincide. The cubic root of 22142251 is about 280.8065646945.

Adding to 22142251 its reverse (15224122), we get a palindrome (37366373).

It can be divided in two parts, 2214 and 2251, that added together give a triangular number (4465 = T₉₄).

The spelling of 22142251 in words is "twenty-two million, one hundred forty-two thousand, two hundred fifty-one".