222222121998 has 16 divisors (see below), whose sum is σ = 444481403520. Its totient is φ = 74067847416.

The previous prime is 222222121981. The next prime is 222222121999. The reversal of 222222121998 is 899121222222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222121999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470268 + ... + 1614351.

It is an arithmetic number, because the mean of its divisors is an integer number (27780087720).

Almost surely, 2^222222121998 is an apocalyptic number.

222222121998 is an abundant number, since it is smaller than the sum of its proper divisors (222259281522).

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

222222121998 is a wasteful number, since it uses less digits than its factorization.

222222121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096631.

The product of its digits is 82944, while the sum is 42.

The spelling of 222222121998 in words is "two hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-eight".