20211320113 has 4 divisors (see below), whose sum is σ = 20222112868. Its totient is φ = 20200527360.

The previous prime is 20211320093. The next prime is 20211320147. The reversal of 20211320113 is 31102311202.

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 6966072369 + 13245247744 = 83463^2 + 115088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211320113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211320713) 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, 5393568 + ... + 5397313.

It is an arithmetic number, because the mean of its divisors is an integer number (5055528217).

Almost surely, 2^20211320113 is an apocalyptic number.

It is an amenable number.

20211320113 is a deficient number, since it is larger than the sum of its proper divisors (10792755).

20211320113 is a wasteful number, since it uses less digits than its factorization.

20211320113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10792754.

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

Adding to 20211320113 its reverse (31102311202), we get a palindrome (51313631315).

The spelling of 20211320113 in words is "twenty billion, two hundred eleven million, three hundred twenty thousand, one hundred thirteen".