21133434233 has 4 divisors (see below), whose sum is σ = 21134705808. Its totient is φ = 21132162660.

The previous prime is 21133434193. The next prime is 21133434253. The reversal of 21133434233 is 33243433112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21133434233 - 2¹² = 21133430137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21133434196 and 21133434205.

It is not an unprimeable number, because it can be changed into a prime (21133434253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610523 + ... + 644208.

It is an arithmetic number, because the mean of its divisors is an integer number (5283676452).

Almost surely, 2^21133434233 is an apocalyptic number.

It is an amenable number.

21133434233 is a deficient number, since it is larger than the sum of its proper divisors (1271575).

21133434233 is a wasteful number, since it uses less digits than its factorization.

21133434233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271574.

The product of its digits is 15552, while the sum is 29.

Adding to 21133434233 its reverse (33243433112), we get a palindrome (54376867345).

The spelling of 21133434233 in words is "twenty-one billion, one hundred thirty-three million, four hundred thirty-four thousand, two hundred thirty-three".