2124421 has 4 divisors (see below), whose sum is σ = 2287852. Its totient is φ = 1960992.

The previous prime is 2124403. The next prime is 2124431. The reversal of 2124421 is 1244212.

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 408321 + 1716100 = 639^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2124421 - 2⁹ = 2123909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2124395 and 2124404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2124401) 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, 81696 + ... + 81721.

It is an arithmetic number, because the mean of its divisors is an integer number (571963).

2^2124421 is an apocalyptic number.

It is an amenable number.

2124421 is a deficient number, since it is larger than the sum of its proper divisors (163431).

2124421 is a wasteful number, since it uses less digits than its factorization.

2124421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163430.

The product of its digits is 128, while the sum is 16.

The square root of 2124421 is about 1457.5393648200. The cubic root of 2124421 is about 128.5524018288.

Adding to 2124421 its reverse (1244212), we get a palindrome (3368633).

It can be divided in two parts, 21 and 24421, that added together give a palindrome (24442).

The spelling of 2124421 in words is "two million, one hundred twenty-four thousand, four hundred twenty-one".