2121439 has 4 divisors (see below), whose sum is σ = 2166624. Its totient is φ = 2076256.

The previous prime is 2121433. The next prime is 2121443. The reversal of 2121439 is 9341212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121439 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 (2121433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22522 + ... + 22615.

It is an arithmetic number, because the mean of its divisors is an integer number (541656).

2^2121439 is an apocalyptic number.

2121439 is a deficient number, since it is larger than the sum of its proper divisors (45185).

2121439 is an equidigital number, since it uses as much as digits as its factorization.

2121439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45184.

The product of its digits is 432, while the sum is 22.

The square root of 2121439 is about 1456.5160486586. The cubic root of 2121439 is about 128.4922249985.

The spelling of 2121439 in words is "two million, one hundred twenty-one thousand, four hundred thirty-nine".