221512133 has 2 divisors, whose sum is σ = 221512134. Its totient is φ = 221512132.

The previous prime is 221512099. The next prime is 221512139. The reversal of 221512133 is 331215122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139192804 + 82319329 = 11798^2 + 9073^2 .

It is a cyclic number.

It is not a de Polignac number, because 221512133 - 2¹⁶ = 221446597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221512139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110756066 + 110756067.

It is an arithmetic number, because the mean of its divisors is an integer number (110756067).

Almost surely, 2^221512133 is an apocalyptic number.

It is an amenable number.

221512133 is a deficient number, since it is larger than the sum of its proper divisors (1).

221512133 is an equidigital number, since it uses as much as digits as its factorization.

221512133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 221512133 is about 14883.2836766622. The cubic root of 221512133 is about 605.0610170001.

Adding to 221512133 its reverse (331215122), we get a palindrome (552727255).

The spelling of 221512133 in words is "two hundred twenty-one million, five hundred twelve thousand, one hundred thirty-three".