20303110021 has 4 divisors (see below), whose sum is σ = 20342080044. Its totient is φ = 20264140000.

The previous prime is 20303109977. The next prime is 20303110039. The reversal of 20303110021 is 12001130302.

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 12760187521 + 7542922500 = 112961^2 + 86850^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303110021 - 2¹⁵ = 20303077253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303109983 and 20303110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303111021) 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, 19484230 + ... + 19485271.

It is an arithmetic number, because the mean of its divisors is an integer number (5085520011).

Almost surely, 2^20303110021 is an apocalyptic number.

It is an amenable number.

20303110021 is a deficient number, since it is larger than the sum of its proper divisors (38970023).

20303110021 is an equidigital number, since it uses as much as digits as its factorization.

20303110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38970022.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20303110021 its reverse (12001130302), we get a palindrome (32304240323).

The spelling of 20303110021 in words is "twenty billion, three hundred three million, one hundred ten thousand, twenty-one".