221883989 has 2 divisors, whose sum is σ = 221883990. Its totient is φ = 221883988.

The previous prime is 221883979. The next prime is 221884007. The reversal of 221883989 is 989388122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186540964 + 35343025 = 13658^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 221883989 - 2⁴ = 221883973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221883929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110941994 + 110941995.

It is an arithmetic number, because the mean of its divisors is an integer number (110941995).

Almost surely, 2^221883989 is an apocalyptic number.

It is an amenable number.

221883989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221883989 is an equidigital number, since it uses as much as digits as its factorization.

221883989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 221883989 is about 14895.7708427594. The cubic root of 221883989 is about 605.3994029575.

The spelling of 221883989 in words is "two hundred twenty-one million, eight hundred eighty-three thousand, nine hundred eighty-nine".