20130035021 has 4 divisors (see below), whose sum is σ = 20130431292. Its totient is φ = 20129638752.

The previous prime is 20130034957. The next prime is 20130035113. The reversal of 20130035021 is 12053003102.

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 10042845796 + 10087189225 = 100214^2 + 100435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130035021 - 2⁶ = 20130034957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130035921) 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 3 ways as a sum of consecutive naturals, for example, 108386 + ... + 228051.

It is an arithmetic number, because the mean of its divisors is an integer number (5032607823).

Almost surely, 2^20130035021 is an apocalyptic number.

It is an amenable number.

20130035021 is a deficient number, since it is larger than the sum of its proper divisors (396271).

20130035021 is an equidigital number, since it uses as much as digits as its factorization.

20130035021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396270.

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 20130035021 its reverse (12053003102), we get a palindrome (32183038123).

The spelling of 20130035021 in words is "twenty billion, one hundred thirty million, thirty-five thousand, twenty-one".