213221133 has 24 divisors (see below), whose sum is σ = 323475840. Its totient is φ = 138809160.

The previous prime is 213221117. The next prime is 213221143. The reversal of 213221133 is 331122312.

It is not a de Polignac number, because 213221133 - 2⁴ = 213221117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47788 + ... + 52058.

It is an arithmetic number, because the mean of its divisors is an integer number (13478160).

Almost surely, 2^213221133 is an apocalyptic number.

It is an amenable number.

213221133 is a deficient number, since it is larger than the sum of its proper divisors (110254707).

213221133 is an equidigital number, since it uses as much as digits as its factorization.

213221133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366 (or 4317 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 213221133 is about 14602.0934458043. The cubic root of 213221133 is about 597.4158613572.

Adding to 213221133 its reverse (331122312), we get a palindrome (544343445).

The spelling of 213221133 in words is "two hundred thirteen million, two hundred twenty-one thousand, one hundred thirty-three".