21597278230 has 16 divisors (see below), whose sum is σ = 42409201104. Its totient is φ = 7853555680.

The previous prime is 21597278191. The next prime is 21597278233. The reversal of 21597278230 is 3287279512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21597278233) 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 7 ways as a sum of consecutive naturals, for example, 98169337 + ... + 98169556.

It is an arithmetic number, because the mean of its divisors is an integer number (2650575069).

Almost surely, 2^21597278230 is an apocalyptic number.

21597278230 is a deficient number, since it is larger than the sum of its proper divisors (20811922874).

21597278230 is a wasteful number, since it uses less digits than its factorization.

21597278230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196338911.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 21597278230 in words is "twenty-one billion, five hundred ninety-seven million, two hundred seventy-eight thousand, two hundred thirty".