221128633 has 8 divisors (see below), whose sum is σ = 242377056. Its totient is φ = 200071200.

The previous prime is 221128619. The next prime is 221128651. The reversal of 221128633 is 336821122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221128633 - 2⁹ = 221128121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221128933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45316 + ... + 49957.

It is an arithmetic number, because the mean of its divisors is an integer number (30297132).

Almost surely, 2^221128633 is an apocalyptic number.

It is an amenable number.

221128633 is a deficient number, since it is larger than the sum of its proper divisors (21248423).

221128633 is a wasteful number, since it uses less digits than its factorization.

221128633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95495.

The product of its digits is 3456, while the sum is 28.

The square root of 221128633 is about 14870.3945139327. The cubic root of 221128633 is about 604.7116381869.

Adding to 221128633 its reverse (336821122), we get a palindrome (557949755).

The spelling of 221128633 in words is "two hundred twenty-one million, one hundred twenty-eight thousand, six hundred thirty-three".