21042113333 has 4 divisors (see below), whose sum is σ = 21489817920. Its totient is φ = 20594408748.

The previous prime is 21042113329. The next prime is 21042113347. The reversal of 21042113333 is 33331124012.

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 21042113333 - 2² = 21042113329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21042113299 and 21042113308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042113633) 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, 223852223 + ... + 223852316.

It is an arithmetic number, because the mean of its divisors is an integer number (5372454480).

Almost surely, 2^21042113333 is an apocalyptic number.

It is an amenable number.

21042113333 is a deficient number, since it is larger than the sum of its proper divisors (447704587).

21042113333 is an equidigital number, since it uses as much as digits as its factorization.

21042113333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447704586.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21042113333 its reverse (33331124012), we get a palindrome (54373237345).

The spelling of 21042113333 in words is "twenty-one billion, forty-two million, one hundred thirteen thousand, three hundred thirty-three".