213332321021 has 2 divisors, whose sum is σ = 213332321022. Its totient is φ = 213332321020.

The previous prime is 213332321011. The next prime is 213332321023. The reversal of 213332321021 is 120123233312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213300804025 + 31516996 = 461845^2 + 5614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213332321021 is a prime.

It is a Sophie Germain prime.

Together with 213332321023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213332321023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106666160510 + 106666160511.

It is an arithmetic number, because the mean of its divisors is an integer number (106666160511).

Almost surely, 2^213332321021 is an apocalyptic number.

It is an amenable number.

213332321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213332321021 is an equidigital number, since it uses as much as digits as its factorization.

213332321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 213332321021 its reverse (120123233312), we get a palindrome (333455554333).

The spelling of 213332321021 in words is "two hundred thirteen billion, three hundred thirty-two million, three hundred twenty-one thousand, twenty-one".