21411823613 has 2 divisors, whose sum is σ = 21411823614. Its totient is φ = 21411823612.

The previous prime is 21411823591. The next prime is 21411823627. The reversal of 21411823613 is 31632811412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14912561689 + 6499261924 = 122117^2 + 80618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21411823613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21411823613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21411823633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705911806 + 10705911807.

It is an arithmetic number, because the mean of its divisors is an integer number (10705911807).

Almost surely, 2^21411823613 is an apocalyptic number.

It is an amenable number.

21411823613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411823613 is an equidigital number, since it uses as much as digits as its factorization.

21411823613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The spelling of 21411823613 in words is "twenty-one billion, four hundred eleven million, eight hundred twenty-three thousand, six hundred thirteen".