2142321 has 4 divisors (see below), whose sum is σ = 2856432. Its totient is φ = 1428212.

The previous prime is 2142299. The next prime is 2142341. The reversal of 2142321 is 1232412.

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 2142321 - 2⁹ = 2141809 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2142321.

It is not an unprimeable number, because it can be changed into a prime (2142341) 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, 357051 + ... + 357056.

It is an arithmetic number, because the mean of its divisors is an integer number (714108).

2^2142321 is an apocalyptic number.

It is an amenable number.

2142321 is a deficient number, since it is larger than the sum of its proper divisors (714111).

2142321 is an equidigital number, since it uses as much as digits as its factorization.

2142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714110.

The product of its digits is 96, while the sum is 15.

The square root of 2142321 is about 1463.6669703180. Note that the first 3 decimals coincide. The cubic root of 2142321 is about 128.9124458473.

Adding to 2142321 its reverse (1232412), we get a palindrome (3374733).

Subtracting from 2142321 its reverse (1232412), we obtain a palindrome (909909).

It can be divided in two parts, 214 and 2321, that multiplied together give a palindrome (496694).

The spelling of 2142321 in words is "two million, one hundred forty-two thousand, three hundred twenty-one".