21476517166669 has 2 divisors, whose sum is σ = 21476517166670. Its totient is φ = 21476517166668.

The previous prime is 21476517166639. The next prime is 21476517166691. The reversal of 21476517166669 is 96666171567412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20069952002500 + 1406565164169 = 4479950^2 + 1185987^2 .

It is a cyclic number.

It is not a de Polignac number, because 21476517166669 - 2⁹ = 21476517166157 is a prime.

It is a super-2 number, since 2×21476517166669² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21476517166639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738258583334 + 10738258583335.

It is an arithmetic number, because the mean of its divisors is an integer number (10738258583335).

Almost surely, 2^{21476517166669} is an apocalyptic number.

It is an amenable number.

21476517166669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476517166669 is an equidigital number, since it uses as much as digits as its factorization.

21476517166669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 67.

The spelling of 21476517166669 in words is "twenty-one trillion, four hundred seventy-six billion, five hundred seventeen million, one hundred sixty-six thousand, six hundred sixty-nine".