21543052875 has 16 divisors (see below), whose sum is σ = 35847640608. Its totient is φ = 11489628000.

The previous prime is 21543052871. The next prime is 21543052877. The reversal of 21543052875 is 57825034512.

It is not a de Polignac number, because 21543052875 - 2² = 21543052871 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21543052871) 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 15 ways as a sum of consecutive naturals, for example, 28723696 + ... + 28724445.

It is an arithmetic number, because the mean of its divisors is an integer number (2240477538).

Almost surely, 2^21543052875 is an apocalyptic number.

21543052875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21543052875 is a deficient number, since it is larger than the sum of its proper divisors (14304587733).

21543052875 is an equidigital number, since it uses as much as digits as its factorization.

21543052875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57448159 (or 57448149 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 21543052875 in words is "twenty-one billion, five hundred forty-three million, fifty-two thousand, eight hundred seventy-five".