221139 has 6 divisors (see below), whose sum is σ = 319436. Its totient is φ = 147420.

The previous prime is 221101. The next prime is 221159. The reversal of 221139 is 931122.

It is a happy number.

It is not a de Polignac number, because 221139 - 2¹¹ = 219091 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221139.

It is not an unprimeable number, because it can be changed into a prime (221159) 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 5 ways as a sum of consecutive naturals, for example, 12277 + ... + 12294.

2²²¹¹³⁹ is an apocalyptic number.

221139 is a deficient number, since it is larger than the sum of its proper divisors (98297).

221139 is a wasteful number, since it uses less digits than its factorization.

221139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24577 (or 24574 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 221139 is about 470.2541865842. The cubic root of 221139 is about 60.4721088113.

It can be divided in two parts, 22113 and 9, that added together give a palindrome (22122).

The spelling of 221139 in words is "two hundred twenty-one thousand, one hundred thirty-nine".