21332433 has 32 divisors (see below), whose sum is σ = 31629312. Its totient is φ = 12729600.

The previous prime is 21332419. The next prime is 21332471. The reversal of 21332433 is 33423312.

It is not a de Polignac number, because 21332433 - 2⁴ = 21332417 is a prime.

It is a super-4 number, since 4×21332433⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21334433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162778 + ... + 162908.

It is an arithmetic number, because the mean of its divisors is an integer number (988416).

Almost surely, 2^21332433 is an apocalyptic number.

It is an amenable number.

21332433 is a deficient number, since it is larger than the sum of its proper divisors (10296879).

21332433 is a wasteful number, since it uses less digits than its factorization.

21332433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its digits is 1296, while the sum is 21.

The square root of 21332433 is about 4618.7046885463. The cubic root of 21332433 is about 277.3406080837.

Adding to 21332433 its reverse (33423312), we get a palindrome (54755745).

The spelling of 21332433 in words is "twenty-one million, three hundred thirty-two thousand, four hundred thirty-three".