21220320113 has 4 divisors (see below), whose sum is σ = 21488931840. Its totient is φ = 20951708388.

The previous prime is 21220320109. The next prime is 21220320151. The reversal of 21220320113 is 31102302212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21220320113 - 2² = 21220320109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220320091 and 21220320100.

It is not an unprimeable number, because it can be changed into a prime (21220320613) 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, 134305745 + ... + 134305902.

It is an arithmetic number, because the mean of its divisors is an integer number (5372232960).

Almost surely, 2^21220320113 is an apocalyptic number.

It is an amenable number.

21220320113 is a deficient number, since it is larger than the sum of its proper divisors (268611727).

21220320113 is an equidigital number, since it uses as much as digits as its factorization.

21220320113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268611726.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220320113 its reverse (31102302212), we get a palindrome (52322622325).

The spelling of 21220320113 in words is "twenty-one billion, two hundred twenty million, three hundred twenty thousand, one hundred thirteen".