21000133313 has 4 divisors (see below), whose sum is σ = 21001732548. Its totient is φ = 20998534080.

The previous prime is 21000133289. The next prime is 21000133351. The reversal of 21000133313 is 31333100012.

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 9829334449 + 11170798864 = 99143^2 + 105692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000133313 - 2¹² = 21000129217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000133291 and 21000133300.

It is not an unprimeable number, because it can be changed into a prime (21000130313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779756 + ... + 806237.

It is an arithmetic number, because the mean of its divisors is an integer number (5250433137).

Almost surely, 2^21000133313 is an apocalyptic number.

It is an amenable number.

21000133313 is a deficient number, since it is larger than the sum of its proper divisors (1599235).

21000133313 is a wasteful number, since it uses less digits than its factorization.

21000133313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599234.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21000133313 its reverse (31333100012), we get a palindrome (52333233325).

The spelling of 21000133313 in words is "twenty-one billion, one hundred thirty-three thousand, three hundred thirteen".