221680089 has 12 divisors (see below), whose sum is σ = 331246500. Its totient is φ = 142690464.

The previous prime is 221680033. The next prime is 221680091. The reversal of 221680089 is 980086122.

It can be written as a sum of positive squares in 2 ways, for example, as 122478489 + 99201600 = 11067^2 + 9960^2 .

It is not a de Polignac number, because 221680089 - 2⁷ = 221679961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221680009) 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, 424414 + ... + 424935.

It is an arithmetic number, because the mean of its divisors is an integer number (27603875).

Almost surely, 2^221680089 is an apocalyptic number.

221680089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

221680089 is a deficient number, since it is larger than the sum of its proper divisors (109566411).

221680089 is a wasteful number, since it uses less digits than its factorization.

221680089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849384 (or 849381 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 221680089 is about 14888.9250451468. The cubic root of 221680089 is about 605.2139024622.

The spelling of 221680089 in words is "two hundred twenty-one million, six hundred eighty thousand, eighty-nine".