21160375 has 8 divisors (see below), whose sum is σ = 26408304. Its totient is φ = 16928200.

The previous prime is 21160339. The next prime is 21160379. The reversal of 21160375 is 57306112.

It is not a de Polignac number, because 21160375 - 2¹⁵ = 21127607 is a prime.

It is a super-2 number, since 2×21160375² = 895522940281250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84517 + ... + 84766.

It is an arithmetic number, because the mean of its divisors is an integer number (3301038).

Almost surely, 2^21160375 is an apocalyptic number.

21160375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21160375 is a deficient number, since it is larger than the sum of its proper divisors (5247929).

21160375 is an equidigital number, since it uses as much as digits as its factorization.

21160375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169298 (or 169288 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21160375 is about 4600.0407606890. The cubic root of 21160375 is about 276.5929587039.

Adding to 21160375 its reverse (57306112), we get a palindrome (78466487).

The spelling of 21160375 in words is "twenty-one million, one hundred sixty thousand, three hundred seventy-five".