21110320213 has 2 divisors, whose sum is σ = 21110320214. Its totient is φ = 21110320212.

The previous prime is 21110320211. The next prime is 21110320247. The reversal of 21110320213 is 31202301112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16972357284 + 4137962929 = 130278^2 + 64327^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110320213 - 2¹ = 21110320211 is a prime.

Together with 21110320211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110320211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555160106 + 10555160107.

It is an arithmetic number, because the mean of its divisors is an integer number (10555160107).

Almost surely, 2^21110320213 is an apocalyptic number.

It is an amenable number.

21110320213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110320213 is an equidigital number, since it uses as much as digits as its factorization.

21110320213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21110320213 its reverse (31202301112), we get a palindrome (52312621325).

The spelling of 21110320213 in words is "twenty-one billion, one hundred ten million, three hundred twenty thousand, two hundred thirteen".