130021405 has 4 divisors (see below), whose sum is σ = 156025692. Its totient is φ = 104017120.

The previous prime is 130021399. The next prime is 130021421. The reversal of 130021405 is 504120031.

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 27019204 + 103002201 = 5198^2 + 10149^2 .

It is not a de Polignac number, because 130021405 - 2¹⁵ = 129988637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 13002136 + ... + 13002145.

It is an arithmetic number, because the mean of its divisors is an integer number (39006423).

Almost surely, 2^130021405 is an apocalyptic number.

It is an amenable number.

130021405 is a deficient number, since it is larger than the sum of its proper divisors (26004287).

130021405 is an equidigital number, since it uses as much as digits as its factorization.

130021405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26004286.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 130021405 is about 11402.6928837008. The cubic root of 130021405 is about 506.6075038163.

Adding to 130021405 its reverse (504120031), we get a palindrome (634141436).

The spelling of 130021405 in words is "one hundred thirty million, twenty-one thousand, four hundred five".