221479998 has 24 divisors (see below), whose sum is σ = 467505288. Its totient is φ = 69940368.

The previous prime is 221479987. The next prime is 221480053. The reversal of 221479998 is 899974122.

221479998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221479998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48961 + ... + 53292.

It is an arithmetic number, because the mean of its divisors is an integer number (19479387).

Almost surely, 2^221479998 is an apocalyptic number.

221479998 is an abundant number, since it is smaller than the sum of its proper divisors (246025290).

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

221479998 is a wasteful number, since it uses less digits than its factorization.

221479998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102296 (or 102277 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 221479998 is about 14882.2040706342. The cubic root of 221479998 is about 605.0317566374.

The spelling of 221479998 in words is "two hundred twenty-one million, four hundred seventy-nine thousand, nine hundred ninety-eight".