21353160 has 32 divisors (see below), whose sum is σ = 64059840. Its totient is φ = 5694144.

The previous prime is 21353159. The next prime is 21353191. The reversal of 21353160 is 6135312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88852 + ... + 89091.

It is an arithmetic number, because the mean of its divisors is an integer number (2001870).

Almost surely, 2^21353160 is an apocalyptic number.

21353160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21353160 is an abundant number, since it is smaller than the sum of its proper divisors (42706680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21353160 is a wasteful number, since it uses less digits than its factorization.

21353160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177957 (or 177953 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21353160 is about 4620.9479546950. The cubic root of 21353160 is about 277.4304021549.

Adding to 21353160 its reverse (6135312), we get a palindrome (27488472).

The spelling of 21353160 in words is "twenty-one million, three hundred fifty-three thousand, one hundred sixty".