169116021 has 12 divisors (see below), whose sum is σ = 250237260. Its totient is φ = 109993920.

The previous prime is 169115993. The next prime is 169116037. The reversal of 169116021 is 120611961.

It can be written as a sum of positive squares in 2 ways, for example, as 78960996 + 90155025 = 8886^2 + 9495^2 .

It is not a de Polignac number, because 169116021 - 2⁶ = 169115957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169116041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228786 + ... + 229523.

It is an arithmetic number, because the mean of its divisors is an integer number (20853105).

Almost surely, 2^169116021 is an apocalyptic number.

It is an amenable number.

169116021 is a deficient number, since it is larger than the sum of its proper divisors (81121239).

169116021 is a wasteful number, since it uses less digits than its factorization.

169116021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458356 (or 458353 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 169116021 is about 13004.4615805500. The cubic root of 169116021 is about 553.0039719496.

Adding to 169116021 its reverse (120611961), we get a palindrome (289727982).

The spelling of 169116021 in words is "one hundred sixty-nine million, one hundred sixteen thousand, twenty-one".