21102211213 has 2 divisors, whose sum is σ = 21102211214. Its totient is φ = 21102211212.

The previous prime is 21102211187. The next prime is 21102211219. The reversal of 21102211213 is 31211220112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12606349284 + 8495861929 = 112278^2 + 92173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102211213 - 2⁵ = 21102211181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102211219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551105606 + 10551105607.

It is an arithmetic number, because the mean of its divisors is an integer number (10551105607).

Almost surely, 2^21102211213 is an apocalyptic number.

It is an amenable number.

21102211213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102211213 is an equidigital number, since it uses as much as digits as its factorization.

21102211213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21102211213 its reverse (31211220112), we get a palindrome (52313431325).

The spelling of 21102211213 in words is "twenty-one billion, one hundred two million, two hundred eleven thousand, two hundred thirteen".