2017421 has 4 divisors (see below), whose sum is σ = 2305632. Its totient is φ = 1729212.

The previous prime is 2017409. The next prime is 2017427. The reversal of 2017421 is 1247102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2017421 - 2¹⁰ = 2016397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2017421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2017427) 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 3 ways as a sum of consecutive naturals, for example, 144095 + ... + 144108.

It is an arithmetic number, because the mean of its divisors is an integer number (576408).

2^2017421 is an apocalyptic number.

It is an amenable number.

2017421 is a deficient number, since it is larger than the sum of its proper divisors (288211).

2017421 is an equidigital number, since it uses as much as digits as its factorization.

2017421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288210.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 2017421 is about 1420.3594615449. The cubic root of 2017421 is about 126.3568660238.

The spelling of 2017421 in words is "two million, seventeen thousand, four hundred twenty-one".