20130003021 has 4 divisors (see below), whose sum is σ = 26840004032. Its totient is φ = 13420002012.

The previous prime is 20130003011. The next prime is 20130003037. The reversal of 20130003021 is 12030003102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20130003021 - 2²¹ = 20127905869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20130002988 and 20130003006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130003011) 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, 3355000501 + ... + 3355000506.

It is an arithmetic number, because the mean of its divisors is an integer number (6710001008).

Almost surely, 2^20130003021 is an apocalyptic number.

It is an amenable number.

20130003021 is a deficient number, since it is larger than the sum of its proper divisors (6710001011).

20130003021 is an equidigital number, since it uses as much as digits as its factorization.

20130003021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710001010.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 20130003021 its reverse (12030003102), we get a palindrome (32160006123).

The spelling of 20130003021 in words is "twenty billion, one hundred thirty million, three thousand, twenty-one".