21106170529 has 2 divisors, whose sum is σ = 21106170530. Its totient is φ = 21106170528.

The previous prime is 21106170469. The next prime is 21106170583. The reversal of 21106170529 is 92507160112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19057250304 + 2048920225 = 138048^2 + 45265^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106170529 - 2⁹ = 21106170017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21106170494 and 21106170503.

It is not a weakly prime, because it can be changed into another prime (21106170629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553085264 + 10553085265.

It is an arithmetic number, because the mean of its divisors is an integer number (10553085265).

Almost surely, 2^21106170529 is an apocalyptic number.

It is an amenable number.

21106170529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106170529 is an equidigital number, since it uses as much as digits as its factorization.

21106170529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 21106170529 in words is "twenty-one billion, one hundred six million, one hundred seventy thousand, five hundred twenty-nine".