213133222321 has 4 divisors (see below), whose sum is σ = 213147076644. Its totient is φ = 213119368000.

The previous prime is 213133222277. The next prime is 213133222327. The reversal of 213133222321 is 123222331312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153733783921 + 59399438400 = 392089^2 + 243720^2 .

It is a cyclic number.

It is not a de Polignac number, because 213133222321 - 2³¹ = 210985738673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213133222327) 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, 6904060 + ... + 6934861.

It is an arithmetic number, because the mean of its divisors is an integer number (53286769161).

Almost surely, 2^213133222321 is an apocalyptic number.

It is an amenable number.

213133222321 is a deficient number, since it is larger than the sum of its proper divisors (13854323).

213133222321 is a wasteful number, since it uses less digits than its factorization.

213133222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13854322.

The product of its digits is 2592, while the sum is 25.

Adding to 213133222321 its reverse (123222331312), we get a palindrome (336355553633).

The spelling of 213133222321 in words is "two hundred thirteen billion, one hundred thirty-three million, two hundred twenty-two thousand, three hundred twenty-one".