20021031113 has 4 divisors (see below), whose sum is σ = 20562140100. Its totient is φ = 19479922128.

The previous prime is 20021031091. The next prime is 20021031133. The reversal of 20021031113 is 31113012002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31113012002 = 2 ⋅15556506001.

It can be written as a sum of positive squares in 2 ways, for example, as 19341021184 + 680009929 = 139072^2 + 26077^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021031113 - 2¹⁸ = 20020768969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021031133) 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, 270554438 + ... + 270554511.

It is an arithmetic number, because the mean of its divisors is an integer number (5140535025).

Almost surely, 2^20021031113 is an apocalyptic number.

It is an amenable number.

20021031113 is a deficient number, since it is larger than the sum of its proper divisors (541108987).

20021031113 is an equidigital number, since it uses as much as digits as its factorization.

20021031113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541108986.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20021031113 its reverse (31113012002), we get a palindrome (51134043115).

The spelling of 20021031113 in words is "twenty billion, twenty-one million, thirty-one thousand, one hundred thirteen".