22251402 has 32 divisors (see below), whose sum is σ = 52358400. Its totient is φ = 6980544.

The previous prime is 22251391. The next prime is 22251421. The reversal of 22251402 is 20415222.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11202 + ... + 13037.

It is an arithmetic number, because the mean of its divisors is an integer number (1636200).

Almost surely, 2^22251402 is an apocalyptic number.

22251402 is an abundant number, since it is smaller than the sum of its proper divisors (30106998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22251402 is a wasteful number, since it uses less digits than its factorization.

22251402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24267 (or 24261 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 22251402 is about 4717.1391753901. The cubic root of 22251402 is about 281.2672238341.

Adding to 22251402 its reverse (20415222), we get a palindrome (42666624).

The spelling of 22251402 in words is "twenty-two million, two hundred fifty-one thousand, four hundred two".