421421213 has 2 divisors, whose sum is σ = 421421214. Its totient is φ = 421421212.

The previous prime is 421421201. The next prime is 421421239. The reversal of 421421213 is 312124124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248314564 + 173106649 = 15758^2 + 13157^2 .

It is a cyclic number.

It is not a de Polignac number, because 421421213 - 2⁶ = 421421149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421421813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210710606 + 210710607.

It is an arithmetic number, because the mean of its divisors is an integer number (210710607).

Almost surely, 2^421421213 is an apocalyptic number.

It is an amenable number.

421421213 is a deficient number, since it is larger than the sum of its proper divisors (1).

421421213 is an equidigital number, since it uses as much as digits as its factorization.

421421213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 421421213 is about 20528.5462953420. The cubic root of 421421213 is about 749.7309927102.

Adding to 421421213 its reverse (312124124), we get a palindrome (733545337).

The spelling of 421421213 in words is "four hundred twenty-one million, four hundred twenty-one thousand, two hundred thirteen".