20103133021 has 4 divisors (see below), whose sum is σ = 20302174044. Its totient is φ = 19904092000.

The previous prime is 20103133009. The next prime is 20103133033. The reversal of 20103133021 is 12033130102.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20103133009) and next prime (20103133033).

It can be written as a sum of positive squares in 2 ways, for example, as 12273537796 + 7829595225 = 110786^2 + 88485^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103133021 - 2⁹ = 20103132509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20103132986 and 20103133004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103133051) 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, 99520360 + ... + 99520561.

It is an arithmetic number, because the mean of its divisors is an integer number (5075543511).

Almost surely, 2^20103133021 is an apocalyptic number.

It is an amenable number.

20103133021 is a deficient number, since it is larger than the sum of its proper divisors (199041023).

20103133021 is a wasteful number, since it uses less digits than its factorization.

20103133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199041022.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20103133021 its reverse (12033130102), we get a palindrome (32136263123).

The spelling of 20103133021 in words is "twenty billion, one hundred three million, one hundred thirty-three thousand, twenty-one".