21585052883515 has 32 divisors (see below), whose sum is σ = 28447780608000. Its totient is φ = 15592127944320.

The previous prime is 21585052883509. The next prime is 21585052883521. The reversal of 21585052883515 is 51538825058512.

It is an interprime number because it is at equal distance from previous prime (21585052883509) and next prime (21585052883521).

It is not a de Polignac number, because 21585052883515 - 2¹¹ = 21585052881467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21585052883515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222388366 + ... + 222485404.

It is an arithmetic number, because the mean of its divisors is an integer number (888993144000).

Almost surely, 2^{21585052883515} is an apocalyptic number.

21585052883515 is a deficient number, since it is larger than the sum of its proper divisors (6862727724485).

21585052883515 is a wasteful number, since it uses less digits than its factorization.

21585052883515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124347.

The product of its (nonzero) digits is 19200000, while the sum is 58.

The spelling of 21585052883515 in words is "twenty-one trillion, five hundred eighty-five billion, fifty-two million, eight hundred eighty-three thousand, five hundred fifteen".