21334213 has 2 divisors, whose sum is σ = 21334214. Its totient is φ = 21334212.

The previous prime is 21334189. The next prime is 21334217. The reversal of 21334213 is 31243312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17164449 + 4169764 = 4143^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 21334213 - 2⁹ = 21333701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21334217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667106 + 10667107.

It is an arithmetic number, because the mean of its divisors is an integer number (10667107).

Almost surely, 2^21334213 is an apocalyptic number.

It is an amenable number.

21334213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334213 is an equidigital number, since it uses as much as digits as its factorization.

21334213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 21334213 is about 4618.8973792454. The cubic root of 21334213 is about 277.3483217304.

Adding to 21334213 its reverse (31243312), we get a palindrome (52577525).

Subtracting 21334213 from its reverse (31243312), we obtain a palindrome (9909099).

The spelling of 21334213 in words is "twenty-one million, three hundred thirty-four thousand, two hundred thirteen".