221660089 has 4 divisors (see below), whose sum is σ = 253325824. Its totient is φ = 189994356.

The previous prime is 221660077. The next prime is 221660113. The reversal of 221660089 is 980066122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221660089 - 2⁵ = 221660057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221660029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15832857 + ... + 15832870.

It is an arithmetic number, because the mean of its divisors is an integer number (63331456).

Almost surely, 2^221660089 is an apocalyptic number.

It is an amenable number.

221660089 is a deficient number, since it is larger than the sum of its proper divisors (31665735).

221660089 is an equidigital number, since it uses as much as digits as its factorization.

221660089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31665734.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 221660089 is about 14888.2533898372. The cubic root of 221660089 is about 605.1957010951.

The spelling of 221660089 in words is "two hundred twenty-one million, six hundred sixty thousand, eighty-nine".