21288109175 has 12 divisors (see below), whose sum is σ = 27041092176. Its totient is φ = 16615108800.

The previous prime is 21288109163. The next prime is 21288109229. The reversal of 21288109175 is 57190188212.

It is not a de Polignac number, because 21288109175 - 2⁴ = 21288109159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10383419 + ... + 10385468.

It is an arithmetic number, because the mean of its divisors is an integer number (2253424348).

Almost surely, 2^21288109175 is an apocalyptic number.

21288109175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21288109175 is a deficient number, since it is larger than the sum of its proper divisors (5752983001).

21288109175 is a wasteful number, since it uses less digits than its factorization.

21288109175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20768938 (or 20768933 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 44.

The spelling of 21288109175 in words is "twenty-one billion, two hundred eighty-eight million, one hundred nine thousand, one hundred seventy-five".