21320010444231 has 32 divisors (see below), whose sum is σ = 32709217867200. Its totient is φ = 13708578723840.

The previous prime is 21320010444203. The next prime is 21320010444263. The reversal of 21320010444231 is 13244401002312.

21320010444231 is a `hidden beast` number, since 2 + 1 + 3 + 200 + 10 + 4 + 442 + 3 + 1 = 666.

It is not a de Polignac number, because 21320010444231 - 2¹¹ = 21320010442183 is a prime.

It is a super-3 number, since 3×21320010444231³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21320010444195 and 21320010444204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320010444281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13796010 + ... + 15263351.

It is an arithmetic number, because the mean of its divisors is an integer number (1022163058350).

Almost surely, 2^{21320010444231} is an apocalyptic number.

21320010444231 is a deficient number, since it is larger than the sum of its proper divisors (11389207422969).

21320010444231 is a wasteful number, since it uses less digits than its factorization.

21320010444231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29060336 (or 29060330 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21320010444231 its reverse (13244401002312), we get a palindrome (34564411446543).

The spelling of 21320010444231 in words is "twenty-one trillion, three hundred twenty billion, ten million, four hundred forty-four thousand, two hundred thirty-one".