21320331133133 has 4 divisors (see below), whose sum is σ = 22055514965340. Its totient is φ = 20585147300928.

The previous prime is 21320331133001. The next prime is 21320331133183. The reversal of 21320331133133 is 33133113302312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18065330610889 + 3255000522244 = 4250333^2 + 1804162^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320331133133 - 2¹² = 21320331129037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 735183832177 = 21320331133133 / (2 + 1 + 3 + 2 + 0 + 3 + 3 + 1 + 1 + 3 + 3 + 1 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320331133096 and 21320331133105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320331133183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367591916060 + ... + 367591916117.

It is an arithmetic number, because the mean of its divisors is an integer number (5513878741335).

Almost surely, 2^{21320331133133} is an apocalyptic number.

It is an amenable number.

21320331133133 is a deficient number, since it is larger than the sum of its proper divisors (735183832207).

21320331133133 is an equidigital number, since it uses as much as digits as its factorization.

21320331133133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735183832206.

The product of its (nonzero) digits is 8748, while the sum is 29.

Adding to 21320331133133 its reverse (33133113302312), we get a palindrome (54453444435445).

The spelling of 21320331133133 in words is "twenty-one trillion, three hundred twenty billion, three hundred thirty-one million, one hundred thirty-three thousand, one hundred thirty-three".