21447160 has 32 divisors (see below), whose sum is σ = 55150560. Its totient is φ = 7353216.

The previous prime is 21447137. The next prime is 21447203. The reversal of 21447160 is 6174412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38019 + ... + 38578.

It is an arithmetic number, because the mean of its divisors is an integer number (1723455).

Almost surely, 2^21447160 is an apocalyptic number.

21447160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21447160 is an abundant number, since it is smaller than the sum of its proper divisors (33703400).

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

21447160 is a wasteful number, since it uses less digits than its factorization.

21447160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76615 (or 76611 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21447160 is about 4631.1078588174. The cubic root of 21447160 is about 277.8369037991.

It can be divided in two parts, 214 and 47160, that added together give a palindrome (47374).

The spelling of 21447160 in words is "twenty-one million, four hundred forty-seven thousand, one hundred sixty".