130472821 has 4 divisors (see below), whose sum is σ = 131014444. Its totient is φ = 129931200.

The previous prime is 130472819. The next prime is 130472833. The reversal of 130472821 is 128274031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128274031 = 43 ⋅2983117.

It can be written as a sum of positive squares in 2 ways, for example, as 118570321 + 11902500 = 10889^2 + 3450^2 .

It is a cyclic number.

It is not a de Polignac number, because 130472821 - 2¹ = 130472819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 130472821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130452821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270450 + ... + 270931.

It is an arithmetic number, because the mean of its divisors is an integer number (32753611).

Almost surely, 2^130472821 is an apocalyptic number.

It is an amenable number.

130472821 is a deficient number, since it is larger than the sum of its proper divisors (541623).

130472821 is an equidigital number, since it uses as much as digits as its factorization.

130472821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541622.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 130472821 is about 11422.4700043379. The cubic root of 130472821 is about 507.1931165765.

The spelling of 130472821 in words is "one hundred thirty million, four hundred seventy-two thousand, eight hundred twenty-one".