7212222 has 12 divisors (see below), whose sum is σ = 15626520. Its totient is φ = 2404068.

The previous prime is 7212211. The next prime is 7212239. The reversal of 7212222 is 2222127.

It is a happy number.

It is a super-2 number, since 2×7212222² = 104032292354568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 400679 = 7212222 / (7 + 2 + 1 + 2 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 7212195 and 7212204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200322 + ... + 200357.

It is an arithmetic number, because the mean of its divisors is an integer number (1302210).

Almost surely, 2^7212222 is an apocalyptic number.

7212222 is an abundant number, since it is smaller than the sum of its proper divisors (8414298).

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

7212222 is a wasteful number, since it uses less digits than its factorization.

7212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400687 (or 400684 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 7212222 is about 2685.5580425677. The cubic root of 7212222 is about 193.2070763711.

Adding to 7212222 its reverse (2222127), we get a palindrome (9434349).

The spelling of 7212222 in words is "seven million, two hundred twelve thousand, two hundred twenty-two".