221553898 has 8 divisors (see below), whose sum is σ = 332462592. Its totient is φ = 110733036.

The previous prime is 221553887. The next prime is 221553901. The reversal of 221553898 is 898355122.

221553898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×221553898² = 98172259437988808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15240 + ... + 25987.

It is an arithmetic number, because the mean of its divisors is an integer number (41557824).

Almost surely, 2^221553898 is an apocalyptic number.

221553898 is a deficient number, since it is larger than the sum of its proper divisors (110908694).

221553898 is a wasteful number, since it uses less digits than its factorization.

221553898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43916.

The product of its digits is 172800, while the sum is 43.

The square root of 221553898 is about 14884.6866947209. The cubic root of 221553898 is about 605.0990416822.

The spelling of 221553898 in words is "two hundred twenty-one million, five hundred fifty-three thousand, eight hundred ninety-eight".