213323432221 has 2 divisors, whose sum is σ = 213323432222. Its totient is φ = 213323432220.

The previous prime is 213323432167. The next prime is 213323432237. The reversal of 213323432221 is 122234323312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205458225625 + 7865206596 = 453275^2 + 88686^2 .

It is a cyclic number.

It is not a de Polignac number, because 213323432221 - 2³¹ = 211175948573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213323432221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213323432321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106661716110 + 106661716111.

It is an arithmetic number, because the mean of its divisors is an integer number (106661716111).

Almost surely, 2^213323432221 is an apocalyptic number.

It is an amenable number.

213323432221 is a deficient number, since it is larger than the sum of its proper divisors (1).

213323432221 is an equidigital number, since it uses as much as digits as its factorization.

213323432221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 28.

Adding to 213323432221 its reverse (122234323312), we get a palindrome (335557755533).

The spelling of 213323432221 in words is "two hundred thirteen billion, three hundred twenty-three million, four hundred thirty-two thousand, two hundred twenty-one".