213340333421 has 2 divisors, whose sum is σ = 213340333422. Its totient is φ = 213340333420.

The previous prime is 213340333403. The next prime is 213340333441. The reversal of 213340333421 is 124333043312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199496222500 + 13844110921 = 446650^2 + 117661^2 .

It is a cyclic number.

It is not a de Polignac number, because 213340333421 - 2¹⁴ = 213340317037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213340333441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106670166710 + 106670166711.

It is an arithmetic number, because the mean of its divisors is an integer number (106670166711).

Almost surely, 2^213340333421 is an apocalyptic number.

It is an amenable number.

213340333421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213340333421 is an equidigital number, since it uses as much as digits as its factorization.

213340333421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 213340333421 its reverse (124333043312), we get a palindrome (337673376733).

The spelling of 213340333421 in words is "two hundred thirteen billion, three hundred forty million, three hundred thirty-three thousand, four hundred twenty-one".