221632249 has 4 divisors (see below), whose sum is σ = 221758336. Its totient is φ = 221506164.

The previous prime is 221632199. The next prime is 221632253. The reversal of 221632249 is 942236122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221632249 - 2⁷ = 221632121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221632249.

It is not an unprimeable number, because it can be changed into a prime (221632049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60369 + ... + 63934.

It is an arithmetic number, because the mean of its divisors is an integer number (55439584).

Almost surely, 2^221632249 is an apocalyptic number.

It is an amenable number.

221632249 is a deficient number, since it is larger than the sum of its proper divisors (126087).

221632249 is a wasteful number, since it uses less digits than its factorization.

221632249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126086.

The product of its digits is 10368, while the sum is 31.

The square root of 221632249 is about 14887.3183951980. The cubic root of 221632249 is about 605.1703629691.

The spelling of 221632249 in words is "two hundred twenty-one million, six hundred thirty-two thousand, two hundred forty-nine".