213413340421 has 2 divisors, whose sum is σ = 213413340422. Its totient is φ = 213413340420.

The previous prime is 213413340407. The next prime is 213413340443. The reversal of 213413340421 is 124043314312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140167872100 + 73245468321 = 374390^2 + 270639^2 .

It is a cyclic number.

It is not a de Polignac number, because 213413340421 - 2³⁵ = 179053602053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213413340421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213413340451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106706670210 + 106706670211.

It is an arithmetic number, because the mean of its divisors is an integer number (106706670211).

Almost surely, 2^213413340421 is an apocalyptic number.

It is an amenable number.

213413340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213413340421 is an equidigital number, since it uses as much as digits as its factorization.

213413340421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 213413340421 its reverse (124043314312), we get a palindrome (337456654733).

The spelling of 213413340421 in words is "two hundred thirteen billion, four hundred thirteen million, three hundred forty thousand, four hundred twenty-one".