221421133 has 2 divisors, whose sum is σ = 221421134. Its totient is φ = 221421132.

The previous prime is 221421113. The next prime is 221421157. The reversal of 221421133 is 331124122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220760164 + 660969 = 14858^2 + 813^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421133 - 2⁹ = 221420621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221421133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710566 + 110710567.

It is an arithmetic number, because the mean of its divisors is an integer number (110710567).

Almost surely, 2^221421133 is an apocalyptic number.

It is an amenable number.

221421133 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421133 is an equidigital number, since it uses as much as digits as its factorization.

221421133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 221421133 is about 14880.2262415596. The cubic root of 221421133 is about 604.9781500658.

Adding to 221421133 its reverse (331124122), we get a palindrome (552545255).

The spelling of 221421133 in words is "two hundred twenty-one million, four hundred twenty-one thousand, one hundred thirty-three".