21353428185 has 8 divisors (see below), whose sum is σ = 34165485120. Its totient is φ = 11388495024.

The previous prime is 21353428157. The next prime is 21353428189. The reversal of 21353428185 is 58182435312.

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

It is not a de Polignac number, because 21353428185 - 2¹⁷ = 21353297113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21353428189) 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, 711780925 + ... + 711780954.

It is an arithmetic number, because the mean of its divisors is an integer number (4270685640).

Almost surely, 2^21353428185 is an apocalyptic number.

It is an amenable number.

21353428185 is a deficient number, since it is larger than the sum of its proper divisors (12812056935).

21353428185 is a wasteful number, since it uses less digits than its factorization.

21353428185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423561887.

The product of its digits is 230400, while the sum is 42.

The spelling of 21353428185 in words is "twenty-one billion, three hundred fifty-three million, four hundred twenty-eight thousand, one hundred eighty-five".