221346889 has 2 divisors, whose sum is σ = 221346890. Its totient is φ = 221346888.

The previous prime is 221346887. The next prime is 221346893. The reversal of 221346889 is 988643122.

221346889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150921225 + 70425664 = 12285^2 + 8392^2 .

It is a cyclic number.

It is not a de Polignac number, because 221346889 - 2¹ = 221346887 is a prime.

Together with 221346887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221346887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110673444 + 110673445.

It is an arithmetic number, because the mean of its divisors is an integer number (110673445).

Almost surely, 2^221346889 is an apocalyptic number.

It is an amenable number.

221346889 is a deficient number, since it is larger than the sum of its proper divisors (1).

221346889 is an equidigital number, since it uses as much as digits as its factorization.

221346889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 221346889 is about 14877.7313122667. The cubic root of 221346889 is about 604.9105247548.

The spelling of 221346889 in words is "two hundred twenty-one million, three hundred forty-six thousand, eight hundred eighty-nine".