21946875875 has 16 divisors (see below), whose sum is σ = 27503389056. Its totient is φ = 17484624000.

The previous prime is 21946875871. The next prime is 21946875893. The reversal of 21946875875 is 57857864912.

It is not a de Polignac number, because 21946875875 - 2² = 21946875871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21946875871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334139 + ... + 394388.

It is an arithmetic number, because the mean of its divisors is an integer number (1718961816).

Almost surely, 2^21946875875 is an apocalyptic number.

21946875875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21946875875 is a deficient number, since it is larger than the sum of its proper divisors (5556513181).

21946875875 is an equidigital number, since it uses as much as digits as its factorization.

21946875875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728783 (or 728773 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 62.

The spelling of 21946875875 in words is "twenty-one billion, nine hundred forty-six million, eight hundred seventy-five thousand, eight hundred seventy-five".