21331983827 has 24 divisors (see below), whose sum is σ = 26853657600. Its totient is φ = 16587307440.

The previous prime is 21331983793. The next prime is 21331983853. The reversal of 21331983827 is 72838913312.

It is not a de Polignac number, because 21331983827 - 2¹⁴ = 21331967443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331983227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379424 + ... + 432002.

It is an arithmetic number, because the mean of its divisors is an integer number (1118902400).

Almost surely, 2^21331983827 is an apocalyptic number.

21331983827 is a deficient number, since it is larger than the sum of its proper divisors (5521673773).

21331983827 is a wasteful number, since it uses less digits than its factorization.

21331983827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53087 (or 53076 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The spelling of 21331983827 in words is "twenty-one billion, three hundred thirty-one million, nine hundred eighty-three thousand, eight hundred twenty-seven".