221222992 has 20 divisors (see below), whose sum is σ = 429074100. Its totient is φ = 110494208.

The previous prime is 221222987. The next prime is 221223001. The reversal of 221222992 is 299222122.

221222992 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 213627456 = 2756^2 + 14616^2 .

It is a super-2 number, since 2×221222992² = 97879224378864128, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 9384 + ... + 23032.

It is an arithmetic number, because the mean of its divisors is an integer number (21453705).

Almost surely, 2^221222992 is an apocalyptic number.

It is an amenable number.

221222992 is a deficient number, since it is larger than the sum of its proper divisors (207851108).

221222992 is a wasteful number, since it uses less digits than its factorization.

221222992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14670 (or 14664 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 221222992 is about 14873.5668889477. The cubic root of 221222992 is about 604.7976392179.

The spelling of 221222992 in words is "two hundred twenty-one million, two hundred twenty-two thousand, nine hundred ninety-two".