7212221222 has 8 divisors (see below), whose sum is σ = 10827637416. Its totient is φ = 3603008752.

The previous prime is 7212221221. The next prime is 7212221249. The reversal of 7212221222 is 2221222127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7212221222² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7212221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548023 + ... + 1552674.

It is an arithmetic number, because the mean of its divisors is an integer number (1353454677).

Almost surely, 2^7212221222 is an apocalyptic number.

7212221222 is a deficient number, since it is larger than the sum of its proper divisors (3615416194).

7212221222 is a wasteful number, since it uses less digits than its factorization.

7212221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101862.

The product of its digits is 896, while the sum is 23.

The square root of 7212221222 is about 84924.7974504502. The cubic root of 7212221222 is about 1932.0706942384.

Adding to 7212221222 its reverse (2221222127), we get a palindrome (9433443349).

The spelling of 7212221222 in words is "seven billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".