21582085833 has 24 divisors (see below), whose sum is σ = 38866441536. Its totient is φ = 11211472800.

The previous prime is 21582085831. The next prime is 21582085867. The reversal of 21582085833 is 33858028512.

It is not a de Polignac number, because 21582085833 - 2¹ = 21582085831 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21582085831) by changing a digit.

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, 15570798 + ... + 15572183.

It is an arithmetic number, because the mean of its divisors is an integer number (1619435064).

Almost surely, 2^21582085833 is an apocalyptic number.

It is an amenable number.

21582085833 is a deficient number, since it is larger than the sum of its proper divisors (17284355703).

21582085833 is a wasteful number, since it uses less digits than its factorization.

21582085833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31143005 (or 31143002 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 21582085833 in words is "twenty-one billion, five hundred eighty-two million, eighty-five thousand, eight hundred thirty-three".