21275130321 has 6 divisors (see below), whose sum is σ = 30730743810. Its totient is φ = 14183420208.

The previous prime is 21275130221. The next prime is 21275130329. The reversal of 21275130321 is 12303157212.

21275130321 is a `hidden beast` number, since 2 + 127 + 513 + 0 + 3 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20430414225 + 844716096 = 142935^2 + 29064^2 .

It is not a de Polignac number, because 21275130321 - 2⁹ = 21275129809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21275130329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1181951676 + ... + 1181951693.

It is an arithmetic number, because the mean of its divisors is an integer number (5121790635).

Almost surely, 2^21275130321 is an apocalyptic number.

It is an amenable number.

21275130321 is a deficient number, since it is larger than the sum of its proper divisors (9455613489).

21275130321 is a wasteful number, since it uses less digits than its factorization.

21275130321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363903375 (or 2363903372 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

Adding to 21275130321 its reverse (12303157212), we get a palindrome (33578287533).

The spelling of 21275130321 in words is "twenty-one billion, two hundred seventy-five million, one hundred thirty thousand, three hundred twenty-one".