20173121 has 8 divisors (see below), whose sum is σ = 20412000. Its totient is φ = 19936000.

The previous prime is 20173091. The next prime is 20173133. The reversal of 20173121 is 12137102.

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 20173121 - 2¹⁴ = 20156737 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 20173121.

It is not an unprimeable number, because it can be changed into a prime (20173141) 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 7 ways as a sum of consecutive naturals, for example, 44705 + ... + 45153.

It is an arithmetic number, because the mean of its divisors is an integer number (2551500).

Almost surely, 2^20173121 is an apocalyptic number.

It is an amenable number.

20173121 is a deficient number, since it is larger than the sum of its proper divisors (238879).

20173121 is a wasteful number, since it uses less digits than its factorization.

20173121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 20173121 is about 4491.4497659442. The cubic root of 20173121 is about 272.2227171324. Note that the first 3 decimals are identical.

The spelling of 20173121 in words is "twenty million, one hundred seventy-three thousand, one hundred twenty-one".