21271310325 has 18 divisors (see below), whose sum is σ = 38099280674. Its totient is φ = 11344698720.

The previous prime is 21271310287. The next prime is 21271310329. The reversal of 21271310325 is 52301317212.

21271310325 is a `hidden beast` number, since 2 + 1 + 27 + 1 + 310 + 325 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 176943204 + 21094367121 = 13302^2 + 145239^2 .

It is not a de Polignac number, because 21271310325 - 2⁶ = 21271310261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271310329) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47269354 + ... + 47269803.

Almost surely, 2^21271310325 is an apocalyptic number.

21271310325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21271310325 is a deficient number, since it is larger than the sum of its proper divisors (16827970349).

21271310325 is a wasteful number, since it uses less digits than its factorization.

21271310325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94539173 (or 94539165 counting only the distinct ones).

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

Adding to 21271310325 its reverse (52301317212), we get a palindrome (73572627537).

The spelling of 21271310325 in words is "twenty-one billion, two hundred seventy-one million, three hundred ten thousand, three hundred twenty-five".