21304685835 has 24 divisors (see below), whose sum is σ = 36931527360. Its totient is φ = 11361451392.

The previous prime is 21304685833. The next prime is 21304685869. The reversal of 21304685835 is 53858640312.

21304685835 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 4 + 68 + 583 + 5 = 666.

It is not a de Polignac number, because 21304685835 - 2¹ = 21304685833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21304685833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 892222 + ... + 915788.

It is an arithmetic number, because the mean of its divisors is an integer number (1538813640).

Almost surely, 2^21304685835 is an apocalyptic number.

21304685835 is a deficient number, since it is larger than the sum of its proper divisors (15626841525).

21304685835 is a wasteful number, since it uses less digits than its factorization.

21304685835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43667 (or 43664 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 21304685835 in words is "twenty-one billion, three hundred four million, six hundred eighty-five thousand, eight hundred thirty-five".