170120921 has 8 divisors (see below), whose sum is σ = 181036800. Its totient is φ = 159306048.

The previous prime is 170120911. The next prime is 170120941. The reversal of 170120921 is 129021071.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 170120921 - 2¹⁴ = 170104537 is a prime.

It is a super-2 number, since 2×170120921² = 57882255523776482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170120911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21761 + ... + 28526.

It is an arithmetic number, because the mean of its divisors is an integer number (22629600).

Almost surely, 2^170120921 is an apocalyptic number.

It is an amenable number.

170120921 is a deficient number, since it is larger than the sum of its proper divisors (10915879).

170120921 is a wasteful number, since it uses less digits than its factorization.

170120921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50503.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 170120921 is about 13043.0410947754. The cubic root of 170120921 is about 554.0971398430.

Adding to 170120921 its reverse (129021071), we get a palindrome (299141992).

It can be divided in two parts, 1701 and 20921, that added together give a palindrome (22622).

The spelling of 170120921 in words is "one hundred seventy million, one hundred twenty thousand, nine hundred twenty-one".