213321788821 has 2 divisors, whose sum is σ = 213321788822. Its totient is φ = 213321788820.

The previous prime is 213321788791. The next prime is 213321788843. The reversal of 213321788821 is 128887123312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206878515921 + 6443272900 = 454839^2 + 80270^2 .

It is a cyclic number.

It is not a de Polignac number, because 213321788821 - 2²⁵ = 213288234389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213321788851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106660894410 + 106660894411.

It is an arithmetic number, because the mean of its divisors is an integer number (106660894411).

Almost surely, 2^213321788821 is an apocalyptic number.

It is an amenable number.

213321788821 is a deficient number, since it is larger than the sum of its proper divisors (1).

213321788821 is an equidigital number, since it uses as much as digits as its factorization.

213321788821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 46.

The spelling of 213321788821 in words is "two hundred thirteen billion, three hundred twenty-one million, seven hundred eighty-eight thousand, eight hundred twenty-one".