7221172 has 24 divisors (see below), whose sum is σ = 15071616. Its totient is φ = 2959968.

The previous prime is 7221169. The next prime is 7221173. The reversal of 7221172 is 2711227.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4963 + ... + 6250.

It is an arithmetic number, because the mean of its divisors is an integer number (627984).

Almost surely, 2^7221172 is an apocalyptic number.

It is an amenable number.

7221172 is an abundant number, since it is smaller than the sum of its proper divisors (7850444).

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

7221172 is a wasteful number, since it uses less digits than its factorization.

7221172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11247 (or 11245 counting only the distinct ones).

The product of its digits is 392, while the sum is 22.

The square root of 7221172 is about 2687.2238462770. The cubic root of 7221172 is about 193.2869633806.

Adding to 7221172 its reverse (2711227), we get a palindrome (9932399).

The spelling of 7221172 in words is "seven million, two hundred twenty-one thousand, one hundred seventy-two".