222121398 has 16 divisors (see below), whose sum is σ = 444440880. Its totient is φ = 74007456.

The previous prime is 222121379. The next prime is 222121423. The reversal of 222121398 is 893121222.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9148 + ... + 22976.

It is an arithmetic number, because the mean of its divisors is an integer number (27777555).

Almost surely, 2^222121398 is an apocalyptic number.

222121398 is an abundant number, since it is smaller than the sum of its proper divisors (222319482).

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

222121398 is a wasteful number, since it uses less digits than its factorization.

222121398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16511.

The product of its digits is 3456, while the sum is 30.

The square root of 222121398 is about 14903.7377191093. The cubic root of 222121398 is about 605.6152455347.

The spelling of 222121398 in words is "two hundred twenty-two million, one hundred twenty-one thousand, three hundred ninety-eight".