2143421 has 8 divisors (see below), whose sum is σ = 2506944. Its totient is φ = 1794240.

The previous prime is 2143417. The next prime is 2143441. The reversal of 2143421 is 1243412.

2143421 = T₂₉₄ + T₂₉₅ + ... + T₃₃₆.

2143421 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 not a de Polignac number, because 2143421 - 2² = 2143417 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 2143421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143441) 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, 3260 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (313368).

2^2143421 is an apocalyptic number.

It is an amenable number.

2143421 is a deficient number, since it is larger than the sum of its proper divisors (363523).

2143421 is an equidigital number, since it uses as much as digits as its factorization.

2143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7171.

The product of its digits is 192, while the sum is 17.

The square root of 2143421 is about 1464.0426906344. The cubic root of 2143421 is about 128.9345059443.

Adding to 2143421 its reverse (1243412), we get a palindrome (3386833).

Subtracting from 2143421 its reverse (1243412), we obtain a palindrome (900009).

The spelling of 2143421 in words is "two million, one hundred forty-three thousand, four hundred twenty-one".