21416433 has 4 divisors (see below), whose sum is σ = 28555248. Its totient is φ = 14277620.

The previous prime is 21416431. The next prime is 21416449. The reversal of 21416433 is 33461412.

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 21416433 - 2¹ = 21416431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21416431) 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, 3569403 + ... + 3569408.

It is an arithmetic number, because the mean of its divisors is an integer number (7138812).

Almost surely, 2^21416433 is an apocalyptic number.

It is an amenable number.

21416433 is a deficient number, since it is larger than the sum of its proper divisors (7138815).

21416433 is an equidigital number, since it uses as much as digits as its factorization.

21416433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138814.

The product of its digits is 1728, while the sum is 24.

The square root of 21416433 is about 4627.7892130044. The cubic root of 21416433 is about 277.7041562344.

Adding to 21416433 its reverse (33461412), we get a palindrome (54877845).

The spelling of 21416433 in words is "twenty-one million, four hundred sixteen thousand, four hundred thirty-three".