21047160 has 32 divisors (see below), whose sum is σ = 63141840. Its totient is φ = 5612544.

The previous prime is 21047153. The next prime is 21047183. The reversal of 21047160 is 6174012.

It is a congruent number.

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, 87577 + ... + 87816.

Almost surely, 2^21047160 is an apocalyptic number.

21047160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21047160 is an abundant number, since it is smaller than the sum of its proper divisors (42094680).

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

21047160 is a wasteful number, since it uses less digits than its factorization.

21047160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175407 (or 175403 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21047160 is about 4587.7183871724. The cubic root of 21047160 is about 276.0987884131.

The spelling of 21047160 in words is "twenty-one million, forty-seven thousand, one hundred sixty".