21002122213 has 2 divisors, whose sum is σ = 21002122214. Its totient is φ = 21002122212.

The previous prime is 21002122171. The next prime is 21002122217. The reversal of 21002122213 is 31222120012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16384512004 + 4617610209 = 128002^2 + 67953^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002122213 - 2¹⁷ = 21001991141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002122217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501061106 + 10501061107.

It is an arithmetic number, because the mean of its divisors is an integer number (10501061107).

Almost surely, 2^21002122213 is an apocalyptic number.

It is an amenable number.

21002122213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002122213 is an equidigital number, since it uses as much as digits as its factorization.

21002122213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002122213 its reverse (31222120012), we get a palindrome (52224242225).

The spelling of 21002122213 in words is "twenty-one billion, two million, one hundred twenty-two thousand, two hundred thirteen".