20310113221 has 4 divisors (see below), whose sum is σ = 20311130700. Its totient is φ = 20309095744.

The previous prime is 20310113207. The next prime is 20310113227. The reversal of 20310113221 is 12231101302.

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 11471481025 + 8838632196 = 107105^2 + 94014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310113221 - 2⁵ = 20310113189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310113195 and 20310113204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310113227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478186 + ... + 518923.

It is an arithmetic number, because the mean of its divisors is an integer number (5077782675).

Almost surely, 2^20310113221 is an apocalyptic number.

It is an amenable number.

20310113221 is a deficient number, since it is larger than the sum of its proper divisors (1017479).

20310113221 is an equidigital number, since it uses as much as digits as its factorization.

20310113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017478.

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

Adding to 20310113221 its reverse (12231101302), we get a palindrome (32541214523).

The spelling of 20310113221 in words is "twenty billion, three hundred ten million, one hundred thirteen thousand, two hundred twenty-one".