21585315035 has 32 divisors (see below), whose sum is σ = 27311800320. Its totient is φ = 16354166400.

The previous prime is 21585315029. The next prime is 21585315043. The reversal of 21585315035 is 53051358512.

It is a happy number.

It is not a de Polignac number, because 21585315035 - 2¹⁸ = 21585052891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21585315035.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3438950 + ... + 3445220.

It is an arithmetic number, because the mean of its divisors is an integer number (853493760).

Almost surely, 2^21585315035 is an apocalyptic number.

21585315035 is a deficient number, since it is larger than the sum of its proper divisors (5726485285).

21585315035 is a wasteful number, since it uses less digits than its factorization.

21585315035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 21585315035 in words is "twenty-one billion, five hundred eighty-five million, three hundred fifteen thousand, thirty-five".