21221122210213 has 2 divisors, whose sum is σ = 21221122210214. Its totient is φ = 21221122210212.

The previous prime is 21221122210139. The next prime is 21221122210243. The reversal of 21221122210213 is 31201222112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18357994252129 + 2863127958084 = 4284623^2 + 1692078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221122210213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221122210243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610561105106 + 10610561105107.

It is an arithmetic number, because the mean of its divisors is an integer number (10610561105107).

Almost surely, 2^{21221122210213} is an apocalyptic number.

It is an amenable number.

21221122210213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221122210213 is an equidigital number, since it uses as much as digits as its factorization.

21221122210213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21221122210213 its reverse (31201222112212), we get a palindrome (52422344322425).

The spelling of 21221122210213 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred ten thousand, two hundred thirteen".