21330020313 has 18 divisors (see below), whose sum is σ = 35840238954. Its totient is φ = 12188582784.

The previous prime is 21330020311. The next prime is 21330020317. The reversal of 21330020313 is 31302003312.

21330020313 is a `hidden beast` number, since 2 + 1 + 330 + 0 + 20 + 313 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17127480384 + 4202539929 = 130872^2 + 64827^2 .

It is not a de Polignac number, because 21330020313 - 2¹ = 21330020311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21330020311) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24183256 + ... + 24184137.

Almost surely, 2^21330020313 is an apocalyptic number.

It is an amenable number.

21330020313 is a deficient number, since it is larger than the sum of its proper divisors (14510218641).

21330020313 is a wasteful number, since it uses less digits than its factorization.

21330020313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48367413 (or 48367403 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21330020313 its reverse (31302003312), we get a palindrome (52632023625).

The spelling of 21330020313 in words is "twenty-one billion, three hundred thirty million, twenty thousand, three hundred thirteen".