21731225768 has 32 divisors (see below), whose sum is σ = 46572614400. Its totient is φ = 9312242112.

The previous prime is 21731225759. The next prime is 21731225779. The reversal of 21731225768 is 86752213712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568193 + ... + 605231.

It is an arithmetic number, because the mean of its divisors is an integer number (1455394200).

Almost surely, 2^21731225768 is an apocalyptic number.

21731225768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21731225768 is an abundant number, since it is smaller than the sum of its proper divisors (24841388632).

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

21731225768 is a wasteful number, since it uses less digits than its factorization.

21731225768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47529 (or 47525 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The spelling of 21731225768 in words is "twenty-one billion, seven hundred thirty-one million, two hundred twenty-five thousand, seven hundred sixty-eight".