21101219697713 has 2 divisors, whose sum is σ = 21101219697714. Its totient is φ = 21101219697712.

The previous prime is 21101219697661. The next prime is 21101219697737. The reversal of 21101219697713 is 31779691210112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21100729163809 + 490533904 = 4593553^2 + 22148^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101219697713 - 2⁸ = 21101219697457 is a prime.

It is a super-2 number, since 2×21101219697713² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21101219697013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550609848856 + 10550609848857.

It is an arithmetic number, because the mean of its divisors is an integer number (10550609848857).

Almost surely, 2^{21101219697713} is an apocalyptic number.

It is an amenable number.

21101219697713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101219697713 is an equidigital number, since it uses as much as digits as its factorization.

21101219697713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 50.

The spelling of 21101219697713 in words is "twenty-one trillion, one hundred one billion, two hundred nineteen million, six hundred ninety-seven thousand, seven hundred thirteen".