221098959 has 12 divisors (see below), whose sum is σ = 323408800. Its totient is φ = 145533024.

The previous prime is 221098883. The next prime is 221098961. The reversal of 221098959 is 959890122.

It is not a de Polignac number, because 221098959 - 2¹⁵ = 221066191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221098159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154774 + ... + 156195.

Almost surely, 2^221098959 is an apocalyptic number.

221098959 is a deficient number, since it is larger than the sum of its proper divisors (102309841).

221098959 is a wasteful number, since it uses less digits than its factorization.

221098959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311054 (or 311051 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 221098959 is about 14869.3967261621. The cubic root of 221098959 is about 604.6845875428.

The spelling of 221098959 in words is "two hundred twenty-one million, ninety-eight thousand, nine hundred fifty-nine".