2140443421 has 4 divisors (see below), whose sum is σ = 2140842112. Its totient is φ = 2140044732.

The previous prime is 2140443373. The next prime is 2140443427. The reversal of 2140443421 is 1243440412.

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 a de Polignac number, because none of the positive numbers 2^k-2140443421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140443427) 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, 191181 + ... + 202066.

It is an arithmetic number, because the mean of its divisors is an integer number (535210528).

Almost surely, 2^2140443421 is an apocalyptic number.

It is an amenable number.

2140443421 is a deficient number, since it is larger than the sum of its proper divisors (398691).

2140443421 is an equidigital number, since it uses as much as digits as its factorization.

2140443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398690.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 2140443421 is about 46264.9264670333. The cubic root of 2140443421 is about 1288.7477423685.

Adding to 2140443421 its reverse (1243440412), we get a palindrome (3383883833).

The spelling of 2140443421 in words is "two billion, one hundred forty million, four hundred forty-three thousand, four hundred twenty-one".