221858889 has 16 divisors (see below), whose sum is σ = 341066112. Its totient is φ = 125653248.

The previous prime is 221858867. The next prime is 221858921. The reversal of 221858889 is 988858122.

It is not a de Polignac number, because 221858889 - 2⁷ = 221858761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221858809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44374 + ... + 49119.

It is an arithmetic number, because the mean of its divisors is an integer number (21316632).

Almost surely, 2^221858889 is an apocalyptic number.

It is an amenable number.

221858889 is a deficient number, since it is larger than the sum of its proper divisors (119207223).

221858889 is a wasteful number, since it uses less digits than its factorization.

221858889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93616.

The product of its digits is 737280, while the sum is 51.

The square root of 221858889 is about 14894.9282979140. The cubic root of 221858889 is about 605.3765740637.

The spelling of 221858889 in words is "two hundred twenty-one million, eight hundred fifty-eight thousand, eight hundred eighty-nine".