21331303333 has 16 divisors (see below), whose sum is σ = 23595960960. Its totient is φ = 19180919296.

The previous prime is 21331303327. The next prime is 21331303349. The reversal of 21331303333 is 33330313312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331303333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21331303298 and 21331303307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331303633) 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, 303258 + ... + 366916.

It is an arithmetic number, because the mean of its divisors is an integer number (1474747560).

Almost surely, 2^21331303333 is an apocalyptic number.

21331303333 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21331303333 is a deficient number, since it is larger than the sum of its proper divisors (2264657627).

21331303333 is a wasteful number, since it uses less digits than its factorization.

21331303333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64556.

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

Adding to 21331303333 its reverse (33330313312), we get a palindrome (54661616645).

The spelling of 21331303333 in words is "twenty-one billion, three hundred thirty-one million, three hundred three thousand, three hundred thirty-three".