130020020021 has 4 divisors (see below), whose sum is σ = 130578046092. Its totient is φ = 129461993952.

The previous prime is 130020019951. The next prime is 130020020051. The reversal of 130020020021 is 120020020031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120020020031 = 51797 ⋅2317123.

It can be written as a sum of positive squares in 2 ways, for example, as 7249671025 + 122770348996 = 85145^2 + 350386^2 .

It is a cyclic number.

It is not a de Polignac number, because 130020020021 - 2¹⁴ = 130020003637 is a prime.

It is a super-2 number, since 2×130020020021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 130020019984 and 130020020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130020020051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279012686 + ... + 279013151.

It is an arithmetic number, because the mean of its divisors is an integer number (32644511523).

Almost surely, 2^130020020021 is an apocalyptic number.

It is an amenable number.

130020020021 is a deficient number, since it is larger than the sum of its proper divisors (558026071).

130020020021 is an equidigital number, since it uses as much as digits as its factorization.

130020020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558026070.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 130020020021 its reverse (120020020031), we get a palindrome (250040040052).

The spelling of 130020020021 in words is "one hundred thirty billion, twenty million, twenty thousand, twenty-one".