221022239 has 4 divisors (see below), whose sum is σ = 223210680. Its totient is φ = 218833800.

The previous prime is 221022233. The next prime is 221022293. The reversal of 221022239 is 932220122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932220122 = 2 ⋅466110061.

It is a cyclic number.

It is not a de Polignac number, because 221022239 - 2²⁴ = 204245023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022233) 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 3 ways as a sum of consecutive naturals, for example, 1094069 + ... + 1094270.

It is an arithmetic number, because the mean of its divisors is an integer number (55802670).

Almost surely, 2^221022239 is an apocalyptic number.

221022239 is a deficient number, since it is larger than the sum of its proper divisors (2188441).

221022239 is a wasteful number, since it uses less digits than its factorization.

221022239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188440.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 221022239 is about 14866.8167070157. The cubic root of 221022239 is about 604.6146388214.

The spelling of 221022239 in words is "two hundred twenty-one million, twenty-two thousand, two hundred thirty-nine".