21102340125511 has 2 divisors, whose sum is σ = 21102340125512. Its totient is φ = 21102340125510.

The previous prime is 21102340125487. The next prime is 21102340125533. The reversal of 21102340125511 is 11552104320112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102340125511 - 2¹⁹ = 21102339601223 is a prime.

It is a super-2 number, since 2×21102340125511² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21102340125511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102340125011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551170062755 + 10551170062756.

It is an arithmetic number, because the mean of its divisors is an integer number (10551170062756).

Almost surely, 2^{21102340125511} is an apocalyptic number.

21102340125511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102340125511 is an equidigital number, since it uses as much as digits as its factorization.

21102340125511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 21102340125511 its reverse (11552104320112), we get a palindrome (32654444445623).

The spelling of 21102340125511 in words is "twenty-one trillion, one hundred two billion, three hundred forty million, one hundred twenty-five thousand, five hundred eleven".