21013231031333 has 16 divisors (see below), whose sum is σ = 21726507340080. Its totient is φ = 20308055556096.

The previous prime is 21013231031161. The next prime is 21013231031357. The reversal of 21013231031333 is 33313013231012.

It can be written as a sum of positive squares in 8 ways, for example, as 9782676186529 + 11230554844804 = 3127727^2 + 3351202^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013231031333 - 2¹⁸ = 21013230769189 is a prime.

It is a super-2 number, since 2×21013231031333² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013231031363) 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, 226613 + ... + 6486741.

It is an arithmetic number, because the mean of its divisors is an integer number (1357906708755).

Almost surely, 2^{21013231031333} is an apocalyptic number.

It is an amenable number.

21013231031333 is a deficient number, since it is larger than the sum of its proper divisors (713276308747).

21013231031333 is a wasteful number, since it uses less digits than its factorization.

21013231031333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6260776.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 21013231031333 its reverse (33313013231012), we get a palindrome (54326244262345).

The spelling of 21013231031333 in words is "twenty-one trillion, thirteen billion, two hundred thirty-one million, thirty-one thousand, three hundred thirty-three".