21020433 has 8 divisors (see below), whose sum is σ = 32031168. Its totient is φ = 12011664.

The previous prime is 21020431. The next prime is 21020437. The reversal of 21020433 is 33402012.

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

It is not a de Polignac number, because 21020433 - 2¹ = 21020431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500466 + ... + 500507.

It is an arithmetic number, because the mean of its divisors is an integer number (4003896).

Almost surely, 2^21020433 is an apocalyptic number.

It is an amenable number.

21020433 is a deficient number, since it is larger than the sum of its proper divisors (11010735).

21020433 is a wasteful number, since it uses less digits than its factorization.

21020433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000983.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21020433 is about 4584.8045759879. The cubic root of 21020433 is about 275.9818697395.

Adding to 21020433 its reverse (33402012), we get a palindrome (54422445).

The spelling of 21020433 in words is "twenty-one million, twenty thousand, four hundred thirty-three".