21415754875 has 8 divisors (see below), whose sum is σ = 26726862240. Its totient is φ = 17132603800.

The previous prime is 21415754827. The next prime is 21415754897. The reversal of 21415754875 is 57845751412.

It is not a de Polignac number, because 21415754875 - 2³¹ = 19268271227 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85662895 + ... + 85663144.

It is an arithmetic number, because the mean of its divisors is an integer number (3340857780).

Almost surely, 2^21415754875 is an apocalyptic number.

21415754875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21415754875 is a deficient number, since it is larger than the sum of its proper divisors (5311107365).

21415754875 is an equidigital number, since it uses as much as digits as its factorization.

21415754875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171326054 (or 171326044 counting only the distinct ones).

The product of its digits is 1568000, while the sum is 49.

The spelling of 21415754875 in words is "twenty-one billion, four hundred fifteen million, seven hundred fifty-four thousand, eight hundred seventy-five".