21411525613 has 2 divisors, whose sum is σ = 21411525614. Its totient is φ = 21411525612.

The previous prime is 21411525607. The next prime is 21411525643. The reversal of 21411525613 is 31652511412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21153666249 + 257859364 = 145443^2 + 16058^2 .

It is a cyclic number.

It is not a de Polignac number, because 21411525613 - 2¹⁷ = 21411394541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21411525643) 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, 10705762806 + 10705762807.

It is an arithmetic number, because the mean of its divisors is an integer number (10705762807).

Almost surely, 2^21411525613 is an apocalyptic number.

It is an amenable number.

21411525613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411525613 is an equidigital number, since it uses as much as digits as its factorization.

21411525613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The spelling of 21411525613 in words is "twenty-one billion, four hundred eleven million, five hundred twenty-five thousand, six hundred thirteen".