169021 has 4 divisors (see below), whose sum is σ = 170172. Its totient is φ = 167872.

The previous prime is 169019. The next prime is 169049. The reversal of 169021 is 120961.

169021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120961 = 73 ⋅1657.

It can be written as a sum of positive squares in 2 ways, for example, as 156025 + 12996 = 395^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 169021 - 2¹ = 169019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 169021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316 + ... + 661.

It is an arithmetic number, because the mean of its divisors is an integer number (42543).

2¹⁶⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

169021 is a deficient number, since it is larger than the sum of its proper divisors (1151).

169021 is an equidigital number, since it uses as much as digits as its factorization.

169021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 169021 is about 411.1216365019. The cubic root of 169021 is about 55.2900380670.

Adding to 169021 its reverse (120961), we get a palindrome (289982).

It can be divided in two parts, 1690 and 21, that added together give a triangular number (1711 = T₅₈).

The spelling of 169021 in words is "one hundred sixty-nine thousand, twenty-one".