21020333013 has 12 divisors (see below), whose sum is σ = 30703858380. Its totient is φ = 13856099136.

The previous prime is 21020332999. The next prime is 21020333017. The reversal of 21020333013 is 31033302012.

It can be written as a sum of positive squares in 2 ways, for example, as 13180647249 + 7839685764 = 114807^2 + 88542^2 .

It is not a de Polignac number, because 21020333013 - 2¹⁷ = 21020201941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020333017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13120506 + ... + 13122107.

It is an arithmetic number, because the mean of its divisors is an integer number (2558654865).

Almost surely, 2^21020333013 is an apocalyptic number.

It is an amenable number.

21020333013 is a deficient number, since it is larger than the sum of its proper divisors (9683525367).

21020333013 is a wasteful number, since it uses less digits than its factorization.

21020333013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26242708 (or 26242705 counting only the distinct ones).

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

Adding to 21020333013 its reverse (31033302012), we get a palindrome (52053635025).

The spelling of 21020333013 in words is "twenty-one billion, twenty million, three hundred thirty-three thousand, thirteen".