130507821 has 8 divisors (see below), whose sum is σ = 193344960. Its totient is φ = 87005196.

The previous prime is 130507813. The next prime is 130507841. The reversal of 130507821 is 128705031.

130507821 is a `hidden beast` number, since 130 + 507 + 8 + 21 = 666.

It is not a de Polignac number, because 130507821 - 2³ = 130507813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4833623 = 130507821 / (1 + 3 + 0 + 5 + 0 + 7 + 8 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130507841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2416785 + ... + 2416838.

It is an arithmetic number, because the mean of its divisors is an integer number (24168120).

Almost surely, 2^130507821 is an apocalyptic number.

It is an amenable number.

130507821 is a deficient number, since it is larger than the sum of its proper divisors (62837139).

130507821 is an equidigital number, since it uses as much as digits as its factorization.

130507821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4833632 (or 4833626 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 130507821 is about 11424.0019695376. The cubic root of 130507821 is about 507.2384649023.

It can be divided in two parts, 130507 and 821, that added together give a triangular number (131328 = T₅₁₂).

The spelling of 130507821 in words is "one hundred thirty million, five hundred seven thousand, eight hundred twenty-one".