21214204213 has 2 divisors, whose sum is σ = 21214204214. Its totient is φ = 21214204212.

The previous prime is 21214204199. The next prime is 21214204217. The reversal of 21214204213 is 31240241212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20645953969 + 568250244 = 143687^2 + 23838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214204213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214204217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607102106 + 10607102107.

It is an arithmetic number, because the mean of its divisors is an integer number (10607102107).

Almost surely, 2^21214204213 is an apocalyptic number.

It is an amenable number.

21214204213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214204213 is an equidigital number, since it uses as much as digits as its factorization.

21214204213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21214204213 its reverse (31240241212), we get a palindrome (52454445425).

The spelling of 21214204213 in words is "twenty-one billion, two hundred fourteen million, two hundred four thousand, two hundred thirteen".