17120921 has 8 divisors (see below), whose sum is σ = 18168480. Its totient is φ = 16077888.

The previous prime is 17120891. The next prime is 17120927. The reversal of 17120921 is 12902171.

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

It is a cyclic number.

It is not a de Polignac number, because 17120921 - 2¹⁰ = 17119897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (17120927) 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, 9710 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (2271060).

Almost surely, 2^17120921 is an apocalyptic number.

It is an amenable number.

17120921 is a deficient number, since it is larger than the sum of its proper divisors (1047559).

17120921 is a wasteful number, since it uses less digits than its factorization.

17120921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

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

The square root of 17120921 is about 4137.7434671569. The cubic root of 17120921 is about 257.7363701339.

The spelling of 17120921 in words is "seventeen million, one hundred twenty thousand, nine hundred twenty-one".