221630439 has 16 divisors (see below), whose sum is σ = 309601280. Its totient is φ = 140849280.

The previous prime is 221630417. The next prime is 221630443. The reversal of 221630439 is 934036122.

It is not a de Polignac number, because 221630439 - 2²⁰ = 220581863 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 (221630489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11554 + ... + 24015.

It is an arithmetic number, because the mean of its divisors is an integer number (19350080).

Almost surely, 2^221630439 is an apocalyptic number.

221630439 is a deficient number, since it is larger than the sum of its proper divisors (87970841).

221630439 is a wasteful number, since it uses less digits than its factorization.

221630439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35670.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 221630439 is about 14887.2576050796. The cubic root of 221630439 is about 605.1687155534.

The spelling of 221630439 in words is "two hundred twenty-one million, six hundred thirty thousand, four hundred thirty-nine".