21186160 has 20 divisors (see below), whose sum is σ = 49258008. Its totient is φ = 8474432.

The previous prime is 21186149. The next prime is 21186169. The reversal of 21186160 is 6168112.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21186169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132334 + ... + 132493.

Almost surely, 2^21186160 is an apocalyptic number.

21186160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21186160 is an abundant number, since it is smaller than the sum of its proper divisors (28071848).

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

21186160 is a wasteful number, since it uses less digits than its factorization.

21186160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264840 (or 264834 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21186160 is about 4602.8425999593. The cubic root of 21186160 is about 276.7052606601.

The spelling of 21186160 in words is "twenty-one million, one hundred eighty-six thousand, one hundred sixty".