21002166606131 has 2 divisors, whose sum is σ = 21002166606132. Its totient is φ = 21002166606130.

The previous prime is 21002166606119. The next prime is 21002166606203. The reversal of 21002166606131 is 13160666120012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002166606131 - 2³⁰ = 21001092864307 is a prime.

It is a super-2 number, since 2×21002166606131² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002166606091 and 21002166606100.

It is not a weakly prime, because it can be changed into another prime (21002166606101) 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, 10501083303065 + 10501083303066.

It is an arithmetic number, because the mean of its divisors is an integer number (10501083303066).

Almost surely, 2^{21002166606131} is an apocalyptic number.

21002166606131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002166606131 is an equidigital number, since it uses as much as digits as its factorization.

21002166606131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21002166606131 in words is "twenty-one trillion, two billion, one hundred sixty-six million, six hundred six thousand, one hundred thirty-one".