168521120 has 24 divisors (see below), whose sum is σ = 398131524. Its totient is φ = 67408384.

The previous prime is 168521113. The next prime is 168521137. The reversal of 168521120 is 21125861.

It can be written as a sum of positive squares in 2 ways, for example, as 160478224 + 8042896 = 12668^2 + 2836^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 168521120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526469 + ... + 526788.

Almost surely, 2^168521120 is an apocalyptic number.

168521120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168521120 is an abundant number, since it is smaller than the sum of its proper divisors (229610404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168521120 is a wasteful number, since it uses less digits than its factorization.

168521120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053272 (or 1053264 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 168521120 is about 12981.5684722610. The cubic root of 168521120 is about 552.3547743856.

Adding to 168521120 its reverse (21125861), we get a palindrome (189646981).

The spelling of 168521120 in words is "one hundred sixty-eight million, five hundred twenty-one thousand, one hundred twenty".