2236421 has 4 divisors (see below), whose sum is σ = 2439744. Its totient is φ = 2033100.

The previous prime is 2236417. The next prime is 2236457. The reversal of 2236421 is 1246322.

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 2236421 - 2² = 2236417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2236393 and 2236402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2236121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101645 + ... + 101666.

It is an arithmetic number, because the mean of its divisors is an integer number (609936).

2^2236421 is an apocalyptic number.

It is an amenable number.

2236421 is a deficient number, since it is larger than the sum of its proper divisors (203323).

2236421 is a wasteful number, since it uses less digits than its factorization.

2236421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203322.

The product of its digits is 576, while the sum is 20.

The square root of 2236421 is about 1495.4668167499. The cubic root of 2236421 is about 130.7729298661.

Subtracting from 2236421 its reverse (1246322), we obtain a palindrome (990099).

The spelling of 2236421 in words is "two million, two hundred thirty-six thousand, four hundred twenty-one".