21864260275 has 24 divisors (see below), whose sum is σ = 31851492624. Its totient is φ = 14678102400.

The previous prime is 21864260237. The next prime is 21864260387. The reversal of 21864260275 is 57206246812.

It is a happy number.

It is not a de Polignac number, because 21864260275 - 2⁹ = 21864259763 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3054364 + ... + 3061513.

It is an arithmetic number, because the mean of its divisors is an integer number (1327145526).

Almost surely, 2^21864260275 is an apocalyptic number.

21864260275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21864260275 is a deficient number, since it is larger than the sum of its proper divisors (9987232349).

21864260275 is a wasteful number, since it uses less digits than its factorization.

21864260275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115911 (or 6115906 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 21864260275 in words is "twenty-one billion, eight hundred sixty-four million, two hundred sixty thousand, two hundred seventy-five".