22221250 has 40 divisors (see below), whose sum is σ = 43158060. Its totient is φ = 8568000.

The previous prime is 22221247. The next prime is 22221259. The reversal of 22221250 is 5212222.

It can be written as a sum of positive squares in 10 ways, for example, as 7834401 + 14386849 = 2799^2 + 3793^2 .

It is not an unprimeable number, because it can be changed into a prime (22221259) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35944 + ... + 36556.

Almost surely, 2^22221250 is an apocalyptic number.

22221250 is a deficient number, since it is larger than the sum of its proper divisors (20936810).

22221250 is an equidigital number, since it uses as much as digits as its factorization.

22221250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22221250 is about 4713.9420870435. The cubic root of 22221250 is about 281.1401216876.

Adding to 22221250 its reverse (5212222), we get a palindrome (27433472).

Subtracting from 22221250 its reverse (5212222), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 22221250 in words is "twenty-two million, two hundred twenty-one thousand, two hundred fifty".