21200131321 has 8 divisors (see below), whose sum is σ = 21281407560. Its totient is φ = 21118916352.

The previous prime is 21200131291. The next prime is 21200131331. The reversal of 21200131321 is 12313100212.

It can be written as a sum of positive squares in 4 ways, for example, as 4902800400 + 16297330921 = 70020^2 + 127661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200131321 - 2¹³ = 21200123129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200131295 and 21200131304.

It is not an unprimeable number, because it can be changed into a prime (21200131331) 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 7 ways as a sum of consecutive naturals, for example, 750571 + ... + 778303.

It is an arithmetic number, because the mean of its divisors is an integer number (2660175945).

Almost surely, 2^21200131321 is an apocalyptic number.

It is an amenable number.

21200131321 is a deficient number, since it is larger than the sum of its proper divisors (81276239).

21200131321 is a wasteful number, since it uses less digits than its factorization.

21200131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30635.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21200131321 its reverse (12313100212), we get a palindrome (33513231533).

The spelling of 21200131321 in words is "twenty-one billion, two hundred million, one hundred thirty-one thousand, three hundred twenty-one".