21110353213 has 2 divisors, whose sum is σ = 21110353214. Its totient is φ = 21110353212.

The previous prime is 21110353171. The next prime is 21110353217. The reversal of 21110353213 is 31235301112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20562699609 + 547653604 = 143397^2 + 23402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110353213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110353217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555176606 + 10555176607.

It is an arithmetic number, because the mean of its divisors is an integer number (10555176607).

Almost surely, 2^21110353213 is an apocalyptic number.

It is an amenable number.

21110353213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110353213 is an equidigital number, since it uses as much as digits as its factorization.

21110353213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21110353213 its reverse (31235301112), we get a palindrome (52345654325).

The spelling of 21110353213 in words is "twenty-one billion, one hundred ten million, three hundred fifty-three thousand, two hundred thirteen".