2173421 has 8 divisors (see below), whose sum is σ = 2242944. Its totient is φ = 2104960.

The previous prime is 2173411. The next prime is 2173447. The reversal of 2173421 is 1243712.

2173421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2173421 - 2⁶ = 2173357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2173393 and 2173402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173411) 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, 5981 + ... + 6333.

It is an arithmetic number, because the mean of its divisors is an integer number (280368).

2^2173421 is an apocalyptic number.

It is an amenable number.

2173421 is a deficient number, since it is larger than the sum of its proper divisors (69523).

2173421 is a wasteful number, since it uses less digits than its factorization.

2173421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its digits is 336, while the sum is 20.

The square root of 2173421 is about 1474.2526920443. The cubic root of 2173421 is about 129.5332572117.

The spelling of 2173421 in words is "two million, one hundred seventy-three thousand, four hundred twenty-one".