21252171300 has 72 divisors (see below), whose sum is σ = 61760692896. Its totient is φ = 5642261760.

The previous prime is 21252171293. The next prime is 21252171313. The reversal of 21252171300 is 317125212.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 87937 + ... + 224136.

Almost surely, 2^21252171300 is an apocalyptic number.

21252171300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21252171300 is an abundant number, since it is smaller than the sum of its proper divisors (40508521596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21252171300 is a wasteful number, since it uses less digits than its factorization.

21252171300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312317 (or 312310 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

Adding to 21252171300 its reverse (317125212), we get a palindrome (21569296512).

The spelling of 21252171300 in words is "twenty-one billion, two hundred fifty-two million, one hundred seventy-one thousand, three hundred".