21033133333 has 4 divisors (see below), whose sum is σ = 21113107488. Its totient is φ = 20953159180.

The previous prime is 21033133313. The next prime is 21033133367. The reversal of 21033133333 is 33333133012.

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 a de Polignac number, because none of the positive numbers 2^k-21033133333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033133298 and 21033133307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033133313) 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, 39986683 + ... + 39987208.

It is an arithmetic number, because the mean of its divisors is an integer number (5278276872).

Almost surely, 2^21033133333 is an apocalyptic number.

It is an amenable number.

21033133333 is a deficient number, since it is larger than the sum of its proper divisors (79974155).

21033133333 is an equidigital number, since it uses as much as digits as its factorization.

21033133333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79974154.

The product of its (nonzero) digits is 4374, while the sum is 25.

Adding to 21033133333 its reverse (33333133012), we get a palindrome (54366266345).

The spelling of 21033133333 in words is "twenty-one billion, thirty-three million, one hundred thirty-three thousand, three hundred thirty-three".