21479842185 has 16 divisors (see below), whose sum is σ = 35476385280. Its totient is φ = 11086369920.

The previous prime is 21479842151. The next prime is 21479842201. The reversal of 21479842185 is 58124897412.

It is not a de Polignac number, because 21479842185 - 2¹² = 21479838089 is a prime.

It is a super-2 number, since 2×21479842185² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23096140 + ... + 23097069.

It is an arithmetic number, because the mean of its divisors is an integer number (2217274080).

Almost surely, 2^21479842185 is an apocalyptic number.

It is an amenable number.

21479842185 is a deficient number, since it is larger than the sum of its proper divisors (13996543095).

21479842185 is a wasteful number, since it uses less digits than its factorization.

21479842185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46193248.

The product of its digits is 1290240, while the sum is 51.

The spelling of 21479842185 in words is "twenty-one billion, four hundred seventy-nine million, eight hundred forty-two thousand, one hundred eighty-five".