211321233332221 has 4 divisors (see below), whose sum is σ = 211501695530944. Its totient is φ = 211140771133500.

The previous prime is 211321233332207. The next prime is 211321233332327. The reversal of 211321233332221 is 122233332123112.

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 a de Polignac number, because none of the positive numbers 2^k-211321233332221 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 (211321233338221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90231097605 + ... + 90231099946.

It is an arithmetic number, because the mean of its divisors is an integer number (52875423882736).

Almost surely, 2^{211321233332221} is an apocalyptic number.

It is an amenable number.

211321233332221 is a deficient number, since it is larger than the sum of its proper divisors (180462198723).

211321233332221 is a wasteful number, since it uses less digits than its factorization.

211321233332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180462198722.

The product of its digits is 15552, while the sum is 31.

Adding to 211321233332221 its reverse (122233332123112), we get a palindrome (333554565455333).

The spelling of 211321233332221 in words is "two hundred eleven trillion, three hundred twenty-one billion, two hundred thirty-three million, three hundred thirty-two thousand, two hundred twenty-one".