21433433 has 12 divisors (see below), whose sum is σ = 25167780. Its totient is φ = 18198432.

The previous prime is 21433427. The next prime is 21433439. The reversal of 21433433 is 33433412.

It is an interprime number because it is at equal distance from previous prime (21433427) and next prime (21433439).

It can be written as a sum of positive squares in 2 ways, for example, as 16540489 + 4892944 = 4067^2 + 2212^2 .

It is not a de Polignac number, because 21433433 - 2⁴ = 21433417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21433399 and 21433408.

It is not an unprimeable number, because it can be changed into a prime (21433439) 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 11 ways as a sum of consecutive naturals, for example, 3335 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (2097315).

Almost surely, 2^21433433 is an apocalyptic number.

It is an amenable number.

21433433 is a deficient number, since it is larger than the sum of its proper divisors (3734347).

21433433 is a wasteful number, since it uses less digits than its factorization.

21433433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136 (or 4129 counting only the distinct ones).

The product of its digits is 2592, while the sum is 23.

The square root of 21433433 is about 4629.6255788130. The cubic root of 21433433 is about 277.7776157451. Note that the first 3 decimals are identical.

Adding to 21433433 its reverse (33433412), we get a palindrome (54866845).

The spelling of 21433433 in words is "twenty-one million, four hundred thirty-three thousand, four hundred thirty-three".