21135562185 has 8 divisors (see below), whose sum is σ = 33816899520. Its totient is φ = 11272299824.

The previous prime is 21135562183. The next prime is 21135562193. The reversal of 21135562185 is 58126553112.

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

It is a cyclic number.

It is not a de Polignac number, because 21135562185 - 2¹ = 21135562183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21135562183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704518725 + ... + 704518754.

It is an arithmetic number, because the mean of its divisors is an integer number (4227112440).

Almost surely, 2^21135562185 is an apocalyptic number.

It is an amenable number.

21135562185 is a deficient number, since it is larger than the sum of its proper divisors (12681337335).

21135562185 is a wasteful number, since it uses less digits than its factorization.

21135562185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409037487.

The product of its digits is 72000, while the sum is 39.

The spelling of 21135562185 in words is "twenty-one billion, one hundred thirty-five million, five hundred sixty-two thousand, one hundred eighty-five".