2133212221 has 4 divisors (see below), whose sum is σ = 2437956832. Its totient is φ = 1828467612.

The previous prime is 2133212197. The next prime is 2133212261. The reversal of 2133212221 is 1222123312.

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 2133212221 - 2⁷ = 2133212093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133212261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152372295 + ... + 152372308.

It is an arithmetic number, because the mean of its divisors is an integer number (609489208).

Almost surely, 2^2133212221 is an apocalyptic number.

It is an amenable number.

2133212221 is a deficient number, since it is larger than the sum of its proper divisors (304744611).

2133212221 is an equidigital number, since it uses as much as digits as its factorization.

2133212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304744610.

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

The square root of 2133212221 is about 46186.7104370943. The cubic root of 2133212221 is about 1287.2948180398.

Adding to 2133212221 its reverse (1222123312), we get a palindrome (3355335533).

The spelling of 2133212221 in words is "two billion, one hundred thirty-three million, two hundred twelve thousand, two hundred twenty-one".