21220333313 has 12 divisors (see below), whose sum is σ = 21489406848. Its totient is φ = 20954395440.

The previous prime is 21220333297. The next prime is 21220333327. The reversal of 21220333313 is 31333302212.

It is not a de Polignac number, because 21220333313 - 2⁴ = 21220333297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220333213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3692120 + ... + 3697862.

It is an arithmetic number, because the mean of its divisors is an integer number (1790783904).

Almost surely, 2^21220333313 is an apocalyptic number.

It is an amenable number.

21220333313 is a deficient number, since it is larger than the sum of its proper divisors (269073535).

21220333313 is an equidigital number, since it uses as much as digits as its factorization.

21220333313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272 (or 6163 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21220333313 its reverse (31333302212), we get a palindrome (52553635525).

The spelling of 21220333313 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-three thousand, three hundred thirteen".