21470433 has 4 divisors (see below), whose sum is σ = 28627248. Its totient is φ = 14313620.

The previous prime is 21470419. The next prime is 21470441. The reversal of 21470433 is 33407412.

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 21470433 - 2⁴ = 21470417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21470443) 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, 3578403 + ... + 3578408.

It is an arithmetic number, because the mean of its divisors is an integer number (7156812).

Almost surely, 2^21470433 is an apocalyptic number.

It is an amenable number.

21470433 is a deficient number, since it is larger than the sum of its proper divisors (7156815).

21470433 is an equidigital number, since it uses as much as digits as its factorization.

21470433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156814.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 21470433 is about 4633.6198592461. The cubic root of 21470433 is about 277.9373640436.

Adding to 21470433 its reverse (33407412), we get a palindrome (54877845).

The spelling of 21470433 in words is "twenty-one million, four hundred seventy thousand, four hundred thirty-three".