20130544021 has 12 divisors (see below), whose sum is σ = 23737950732. Its totient is φ = 17018382528.

The previous prime is 20130544013. The next prime is 20130544037. The reversal of 20130544021 is 12044503102.

It can be written as a sum of positive squares in 2 ways, for example, as 8251723921 + 11878820100 = 90839^2 + 108990^2 .

It is not a de Polignac number, because 20130544021 - 2³ = 20130544013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20130543983 and 20130544001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130544001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2810310 + ... + 2817463.

It is an arithmetic number, because the mean of its divisors is an integer number (1978162561).

Almost surely, 2^20130544021 is an apocalyptic number.

It is an amenable number.

20130544021 is a deficient number, since it is larger than the sum of its proper divisors (3607406711).

20130544021 is an equidigital number, since it uses as much as digits as its factorization.

20130544021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5627860 (or 5627853 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 20130544021 in words is "twenty billion, one hundred thirty million, five hundred forty-four thousand, twenty-one".