21020320231133 has 16 divisors (see below), whose sum is σ = 22325773046400. Its totient is φ = 19748098318080.

The previous prime is 21020320231123. The next prime is 21020320231139. The reversal of 21020320231133 is 33113202302012.

It is a cyclic number.

It is not a de Polignac number, because 21020320231133 - 2¹⁰ = 21020320230109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020320231099 and 21020320231108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020320231139) 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, 5328128 + ... + 8392233.

It is an arithmetic number, because the mean of its divisors is an integer number (1395360815400).

Almost surely, 2^{21020320231133} is an apocalyptic number.

21020320231133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21020320231133 is a deficient number, since it is larger than the sum of its proper divisors (1305452815267).

21020320231133 is a wasteful number, since it uses less digits than its factorization.

21020320231133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13721572.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21020320231133 its reverse (33113202302012), we get a palindrome (54133522533145).

The spelling of 21020320231133 in words is "twenty-one trillion, twenty billion, three hundred twenty million, two hundred thirty-one thousand, one hundred thirty-three".