21120433 has 8 divisors (see below), whose sum is σ = 21497000. Its totient is φ = 20746368.

The previous prime is 21120431. The next prime is 21120461. The reversal of 21120433 is 33402112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6466849 + 14653584 = 2543^2 + 3828^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21120433 - 2¹ = 21120431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120431) 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, 25063 + ... + 25891.

It is an arithmetic number, because the mean of its divisors is an integer number (2687125).

Almost surely, 2^21120433 is an apocalyptic number.

It is an amenable number.

21120433 is a deficient number, since it is larger than the sum of its proper divisors (376567).

21120433 is an equidigital number, since it uses as much as digits as its factorization.

21120433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21120433 is about 4595.6972267546. The cubic root of 21120433 is about 276.4188182111.

Adding to 21120433 its reverse (33402112), we get a palindrome (54522545).

The spelling of 21120433 in words is "twenty-one million, one hundred twenty thousand, four hundred thirty-three".