21033023433 has 16 divisors (see below), whose sum is σ = 28324647936. Its totient is φ = 13881787920.

The previous prime is 21033023423. The next prime is 21033023489. The reversal of 21033023433 is 33432033012.

It is a happy number.

It is not a de Polignac number, because 21033023433 - 2⁹ = 21033022921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033023423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1329178 + ... + 1344908.

It is an arithmetic number, because the mean of its divisors is an integer number (1770290496).

Almost surely, 2^21033023433 is an apocalyptic number.

It is an amenable number.

21033023433 is a deficient number, since it is larger than the sum of its proper divisors (7291624503).

21033023433 is a wasteful number, since it uses less digits than its factorization.

21033023433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20164.

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21033023433 its reverse (33432033012), we get a palindrome (54465056445).

The spelling of 21033023433 in words is "twenty-one billion, thirty-three million, twenty-three thousand, four hundred thirty-three".