21821103375 has 64 divisors (see below), whose sum is σ = 39883484160. Its totient is φ = 10545955200.

The previous prime is 21821103347. The next prime is 21821103377. The reversal of 21821103375 is 57330112812.

It is a happy number.

It is not a de Polignac number, because 21821103375 - 2⁷ = 21821103247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21821103377) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 97297 + ... + 230453.

It is an arithmetic number, because the mean of its divisors is an integer number (623179440).

Almost surely, 2^21821103375 is an apocalyptic number.

21821103375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21821103375 is a deficient number, since it is larger than the sum of its proper divisors (18062380785).

21821103375 is a wasteful number, since it uses less digits than its factorization.

21821103375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133217 (or 133207 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21821103375 in words is "twenty-one billion, eight hundred twenty-one million, one hundred three thousand, three hundred seventy-five".