221320133 has 4 divisors (see below), whose sum is σ = 226029120. Its totient is φ = 216611148.

The previous prime is 221320079. The next prime is 221320153. The reversal of 221320133 is 331023122.

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 221320133 - 2⁸ = 221319877 is a prime.

It is a super-2 number, since 2×221320133² = 97965202542275378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2354423 + ... + 2354516.

It is an arithmetic number, because the mean of its divisors is an integer number (56507280).

Almost surely, 2^221320133 is an apocalyptic number.

It is an amenable number.

221320133 is a deficient number, since it is larger than the sum of its proper divisors (4708987).

221320133 is an equidigital number, since it uses as much as digits as its factorization.

221320133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708986.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221320133 is about 14876.8320888555. The cubic root of 221320133 is about 604.8861502865.

Adding to 221320133 its reverse (331023122), we get a palindrome (552343255).

The spelling of 221320133 in words is "two hundred twenty-one million, three hundred twenty thousand, one hundred thirty-three".