221558890 has 24 divisors (see below), whose sum is σ = 463918212. Its totient is φ = 75962880.

The previous prime is 221558881. The next prime is 221558903. The reversal of 221558890 is 98855122.

221558890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 188046369 + 33512521 = 13713^2 + 5789^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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, 225591 + ... + 226570.

Almost surely, 2^221558890 is an apocalyptic number.

221558890 is an abundant number, since it is smaller than the sum of its proper divisors (242359322).

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

221558890 is a wasteful number, since it uses less digits than its factorization.

221558890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452182 (or 452175 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 221558890 is about 14884.8543828954. The cubic root of 221558890 is about 605.1035862976.

The spelling of 221558890 in words is "two hundred twenty-one million, five hundred fifty-eight thousand, eight hundred ninety".