21020130203 has 4 divisors (see below), whose sum is σ = 21086440080. Its totient is φ = 20953820328.

The previous prime is 21020130167. The next prime is 21020130221. The reversal of 21020130203 is 30203102012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21020130203 - 2²⁰ = 21019081627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020130253) 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, 33154463 + ... + 33155096.

It is an arithmetic number, because the mean of its divisors is an integer number (5271610020).

Almost surely, 2^21020130203 is an apocalyptic number.

21020130203 is a deficient number, since it is larger than the sum of its proper divisors (66309877).

21020130203 is an equidigital number, since it uses as much as digits as its factorization.

21020130203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66309876.

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

Adding to 21020130203 its reverse (30203102012), we get a palindrome (51223232215).

The spelling of 21020130203 in words is "twenty-one billion, twenty million, one hundred thirty thousand, two hundred three".