221632653 has 16 divisors (see below), whose sum is σ = 324919296. Its totient is φ = 133262640.

The previous prime is 221632633. The next prime is 221632679. The reversal of 221632653 is 356236122.

It is not a de Polignac number, because 221632653 - 2⁹ = 221632141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221632653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221632603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22251 + ... + 30632.

It is an arithmetic number, because the mean of its divisors is an integer number (20307456).

Almost surely, 2^221632653 is an apocalyptic number.

It is an amenable number.

221632653 is a deficient number, since it is larger than the sum of its proper divisors (103286643).

221632653 is a wasteful number, since it uses less digits than its factorization.

221632653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53024.

The product of its digits is 12960, while the sum is 30.

The square root of 221632653 is about 14887.3319637872. The cubic root of 221632653 is about 605.1707306784.

Adding to 221632653 its reverse (356236122), we get a palindrome (577868775).

The spelling of 221632653 in words is "two hundred twenty-one million, six hundred thirty-two thousand, six hundred fifty-three".