21020313330 has 48 divisors (see below), whose sum is σ = 54672358104. Its totient is φ = 5603412480.

The previous prime is 21020313311. The next prime is 21020313359. The reversal of 21020313330 is 3331302012.

21020313330 is a `hidden beast` number, since 2 + 1 + 0 + 20 + 313 + 330 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5662412001 + 15357901329 = 75249^2 + 123927^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220420 + ... + 301040.

Almost surely, 2^21020313330 is an apocalyptic number.

21020313330 is an abundant number, since it is smaller than the sum of its proper divisors (33652044774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020313330 is a wasteful number, since it uses less digits than its factorization.

21020313330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83531 (or 83528 counting only the distinct ones).

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

Adding to 21020313330 its reverse (3331302012), we get a palindrome (24351615342).

The spelling of 21020313330 in words is "twenty-one billion, twenty million, three hundred thirteen thousand, three hundred thirty".