222121999 has 12 divisors (see below), whose sum is σ = 244839168. Its totient is φ = 201359840.

The previous prime is 222121981. The next prime is 222122023. The reversal of 222121999 is 999121222.

222121999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222121999 - 2⁷ = 222121871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43947 + ... + 48739.

It is an arithmetic number, because the mean of its divisors is an integer number (20403264).

Almost surely, 2^222121999 is an apocalyptic number.

222121999 is a deficient number, since it is larger than the sum of its proper divisors (22717169).

222121999 is a wasteful number, since it uses less digits than its factorization.

222121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5198 (or 5187 counting only the distinct ones).

The product of its digits is 11664, while the sum is 37.

The square root of 222121999 is about 14903.7578818230. The cubic root of 222121999 is about 605.6157917441.

It can be divided in two parts, 222 and 121999, that added together give a palindrome (122221).

The spelling of 222121999 in words is "two hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-nine".