21021030333 has 20 divisors (see below), whose sum is σ = 31490785788. Its totient is φ = 13974301440.

The previous prime is 21021030293. The next prime is 21021030367. The reversal of 21021030333 is 33303012012.

It can be written as a sum of positive squares in 2 ways, for example, as 4750242084 + 16270788249 = 68922^2 + 127557^2 .

It is not a de Polignac number, because 21021030333 - 2³³ = 12431095741 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021040333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 338998 + ... + 396183.

Almost surely, 2^21021030333 is an apocalyptic number.

It is an amenable number.

21021030333 is a deficient number, since it is larger than the sum of its proper divisors (10469755455).

21021030333 is an equidigital number, since it uses as much as digits as its factorization.

21021030333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735546 (or 735537 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21021030333 its reverse (33303012012), we get a palindrome (54324042345).

The spelling of 21021030333 in words is "twenty-one billion, twenty-one million, thirty thousand, three hundred thirty-three".