2169421 has 8 divisors (see below), whose sum is σ = 2359800. Its totient is φ = 1986048.

The previous prime is 2169397. The next prime is 2169443. The reversal of 2169421 is 1249612.

It can be written as a sum of positive squares in 4 ways, for example, as 346921 + 1822500 = 589^2 + 1350^2 .

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 2169421 - 2⁵ = 2169389 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2169821) 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, 1096 + ... + 2353.

It is an arithmetic number, because the mean of its divisors is an integer number (294975).

2^2169421 is an apocalyptic number.

It is an amenable number.

2169421 is a deficient number, since it is larger than the sum of its proper divisors (190379).

2169421 is a wasteful number, since it uses less digits than its factorization.

2169421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503.

The product of its digits is 864, while the sum is 25.

The square root of 2169421 is about 1472.8954477491. The cubic root of 2169421 is about 129.4537433617.

The spelling of 2169421 in words is "two million, one hundred sixty-nine thousand, four hundred twenty-one".