21478640183 has 48 divisors (see below), whose sum is σ = 30320629248. Its totient is φ = 14777294400.

The previous prime is 21478640171. The next prime is 21478640203. The reversal of 21478640183 is 38104687412.

It is not a de Polignac number, because 21478640183 - 2¹⁴ = 21478623799 is a prime.

It is a super-2 number, since 2×21478640183² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478640783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210848 + ... + 295658.

It is an arithmetic number, because the mean of its divisors is an integer number (631679776).

Almost surely, 2^21478640183 is an apocalyptic number.

21478640183 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21478640183 is a deficient number, since it is larger than the sum of its proper divisors (8841989065).

21478640183 is a wasteful number, since it uses less digits than its factorization.

21478640183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84876 (or 84865 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 21478640183 in words is "twenty-one billion, four hundred seventy-eight million, six hundred forty thousand, one hundred eighty-three".