220121998 has 4 divisors (see below), whose sum is σ = 330183000. Its totient is φ = 110060998.

The previous prime is 220121987. The next prime is 220121999. The reversal of 220121998 is 899121022.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55030498 + ... + 55030501.

It is an arithmetic number, because the mean of its divisors is an integer number (82545750).

Almost surely, 2^220121998 is an apocalyptic number.

220121998 is a deficient number, since it is larger than the sum of its proper divisors (110061002).

220121998 is a wasteful number, since it uses less digits than its factorization.

220121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110061001.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 220121998 is about 14836.5089559505. The cubic root of 220121998 is about 603.7926407621.

The spelling of 220121998 in words is "two hundred twenty million, one hundred twenty-one thousand, nine hundred ninety-eight".