20113313221 has 4 divisors (see below), whose sum is σ = 20143023372. Its totient is φ = 20083603072.

The previous prime is 20113313219. The next prime is 20113313237. The reversal of 20113313221 is 12231331102.

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 12047477121 + 8065836100 = 109761^2 + 89810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113313221 - 2¹ = 20113313219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113313201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14854060 + ... + 14855413.

It is an arithmetic number, because the mean of its divisors is an integer number (5035755843).

Almost surely, 2^20113313221 is an apocalyptic number.

It is an amenable number.

20113313221 is a deficient number, since it is larger than the sum of its proper divisors (29710151).

20113313221 is an equidigital number, since it uses as much as digits as its factorization.

20113313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29710150.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20113313221 its reverse (12231331102), we get a palindrome (32344644323).

The spelling of 20113313221 in words is "twenty billion, one hundred thirteen million, three hundred thirteen thousand, two hundred twenty-one".