2146421 has 4 divisors (see below), whose sum is σ = 2149644. Its totient is φ = 2143200.

The previous prime is 2146393. The next prime is 2146423. The reversal of 2146421 is 1246412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 835396 = 1145^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2146421 - 2⁶ = 2146357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2146393 and 2146402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2146423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (537411).

2^2146421 is an apocalyptic number.

It is an amenable number.

2146421 is a deficient number, since it is larger than the sum of its proper divisors (3223).

2146421 is an equidigital number, since it uses as much as digits as its factorization.

2146421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222.

The product of its digits is 384, while the sum is 20.

The square root of 2146421 is about 1465.0668926708. The cubic root of 2146421 is about 128.9946315095.

Subtracting from 2146421 its reverse (1246412), we obtain a palindrome (900009).

The spelling of 2146421 in words is "two million, one hundred forty-six thousand, four hundred twenty-one".