21145832875 has 16 divisors (see below), whose sum is σ = 26400860928. Its totient is φ = 16909704000.

The previous prime is 21145832863. The next prime is 21145832881. The reversal of 21145832875 is 57823854112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21145832875 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281574 + ... + 348676.

It is an arithmetic number, because the mean of its divisors is an integer number (1650053808).

Almost surely, 2^21145832875 is an apocalyptic number.

21145832875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21145832875 is a deficient number, since it is larger than the sum of its proper divisors (5255028053).

21145832875 is an equidigital number, since it uses as much as digits as its factorization.

21145832875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69639 (or 69629 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The spelling of 21145832875 in words is "twenty-one billion, one hundred forty-five million, eight hundred thirty-two thousand, eight hundred seventy-five".