130512190021 has 4 divisors (see below), whose sum is σ = 130802863500. Its totient is φ = 130221516544.

The previous prime is 130512190013. The next prime is 130512190087. The reversal of 130512190021 is 120091215031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120091215031 = 101 ⋅1189021931.

It can be written as a sum of positive squares in 2 ways, for example, as 47835813796 + 82676376225 = 218714^2 + 287535^2 .

It is a cyclic number.

It is not a de Polignac number, because 130512190021 - 2³ = 130512190013 is a prime.

It is a super-2 number, since 2×130512190021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130512170021) 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, 145336066 + ... + 145336963.

It is an arithmetic number, because the mean of its divisors is an integer number (32700715875).

Almost surely, 2^130512190021 is an apocalyptic number.

It is an amenable number.

130512190021 is a deficient number, since it is larger than the sum of its proper divisors (290673479).

130512190021 is an equidigital number, since it uses as much as digits as its factorization.

130512190021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290673478.

The product of its (nonzero) digits is 540, while the sum is 25.

The spelling of 130512190021 in words is "one hundred thirty billion, five hundred twelve million, one hundred ninety thousand, twenty-one".