21791383536 has 80 divisors (see below), whose sum is σ = 62580439040. Its totient is φ = 6488743680.

The previous prime is 21791383529. The next prime is 21791383541. The reversal of 21791383536 is 63538319712.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543916 + ... + 582603.

It is an arithmetic number, because the mean of its divisors is an integer number (782255488).

Almost surely, 2^21791383536 is an apocalyptic number.

21791383536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21791383536 is an abundant number, since it is smaller than the sum of its proper divisors (40789055504).

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

21791383536 is a wasteful number, since it uses less digits than its factorization.

21791383536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126574 (or 1126568 counting only the distinct ones).

The product of its digits is 816480, while the sum is 48.

The spelling of 21791383536 in words is "twenty-one billion, seven hundred ninety-one million, three hundred eighty-three thousand, five hundred thirty-six".