21412433 has 8 divisors (see below), whose sum is σ = 24807168. Its totient is φ = 18101664.

The previous prime is 21412429. The next prime is 21412439. The reversal of 21412433 is 33421412.

21412433 is nontrivially palindromic in base 8.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21412433 - 2² = 21412429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20441 + ... + 21462.

It is an arithmetic number, because the mean of its divisors is an integer number (3100896).

Almost surely, 2^21412433 is an apocalyptic number.

It is an amenable number.

21412433 is a deficient number, since it is larger than the sum of its proper divisors (3394735).

21412433 is an equidigital number, since it uses as much as digits as its factorization.

21412433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41983.

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

The square root of 21412433 is about 4627.3570210218. The cubic root of 21412433 is about 277.6868659946.

Adding to 21412433 its reverse (33421412), we get a palindrome (54833845).

It can be divided in two parts, 214 and 12433, that multiplied together give a palindrome (2660662).

The spelling of 21412433 in words is "twenty-one million, four hundred twelve thousand, four hundred thirty-three".