21271914500 has 24 divisors (see below), whose sum is σ = 46457862360. Its totient is φ = 8508765600.

The previous prime is 21271914491. The next prime is 21271914577. The reversal of 21271914500 is 541917212.

It can be written as a sum of positive squares in 4 ways, for example, as 2514420736 + 18757493764 = 50144^2 + 136958^2 .

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 7 ways as a sum of consecutive naturals, for example, 21271415 + ... + 21272414.

It is an arithmetic number, because the mean of its divisors is an integer number (1935744265).

Almost surely, 2^21271914500 is an apocalyptic number.

21271914500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21271914500 is an abundant number, since it is smaller than the sum of its proper divisors (25185947860).

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

21271914500 is a wasteful number, since it uses less digits than its factorization.

21271914500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42543848 (or 42543836 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 21271914500 in words is "twenty-one billion, two hundred seventy-one million, nine hundred fourteen thousand, five hundred".