21585775382 has 8 divisors (see below), whose sum is σ = 32400982152. Its totient is φ = 10785448000.

The previous prime is 21585775363. The next prime is 21585775427. The reversal of 21585775382 is 28357758512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3716219 + ... + 3722022.

It is an arithmetic number, because the mean of its divisors is an integer number (4050122769).

Almost surely, 2^21585775382 is an apocalyptic number.

21585775382 is a deficient number, since it is larger than the sum of its proper divisors (10815206770).

21585775382 is a wasteful number, since it uses less digits than its factorization.

21585775382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7439694.

The product of its digits is 4704000, while the sum is 53.

The spelling of 21585775382 in words is "twenty-one billion, five hundred eighty-five million, seven hundred seventy-five thousand, three hundred eighty-two".