221633045 has 4 divisors (see below), whose sum is σ = 265959660. Its totient is φ = 177306432.

The previous prime is 221633023. The next prime is 221633053. The reversal of 221633045 is 540336122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540336122 = 2 ⋅270168061.

It can be written as a sum of positive squares in 2 ways, for example, as 140019889 + 81613156 = 11833^2 + 9034^2 .

It is a cyclic number.

It is not a de Polignac number, because 221633045 - 2¹⁸ = 221370901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22163300 + ... + 22163309.

It is an arithmetic number, because the mean of its divisors is an integer number (66489915).

Almost surely, 2^221633045 is an apocalyptic number.

It is an amenable number.

221633045 is a deficient number, since it is larger than the sum of its proper divisors (44326615).

221633045 is an equidigital number, since it uses as much as digits as its factorization.

221633045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44326614.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 221633045 is about 14887.3451293372. The cubic root of 221633045 is about 605.1710874651.

Adding to 221633045 its reverse (540336122), we get a palindrome (761969167).

The spelling of 221633045 in words is "two hundred twenty-one million, six hundred thirty-three thousand, forty-five".