20303012021 has 4 divisors (see below), whose sum is σ = 20504032044. Its totient is φ = 20101992000.

The previous prime is 20303012017. The next prime is 20303012029. The reversal of 20303012021 is 12021030302.

It is a happy number.

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 8771259025 + 11531752996 = 93655^2 + 107386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303012021 - 2² = 20303012017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303011987 and 20303012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100509860 + ... + 100510061.

It is an arithmetic number, because the mean of its divisors is an integer number (5126008011).

Almost surely, 2^20303012021 is an apocalyptic number.

It is an amenable number.

20303012021 is a deficient number, since it is larger than the sum of its proper divisors (201020023).

20303012021 is a wasteful number, since it uses less digits than its factorization.

20303012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201020022.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20303012021 its reverse (12021030302), we get a palindrome (32324042323).

The spelling of 20303012021 in words is "twenty billion, three hundred three million, twelve thousand, twenty-one".