21417160 has 32 divisors (see below), whose sum is σ = 48324600. Its totient is φ = 8542720.

The previous prime is 21417131. The next prime is 21417169. The reversal of 21417160 is 6171412.

It can be written as a sum of positive squares in 4 ways, for example, as 14853316 + 6563844 = 3854^2 + 2562^2 .

It is not an unprimeable number, because it can be changed into a prime (21417169) by changing a digit.

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, 22290 + ... + 23230.

Almost surely, 2^21417160 is an apocalyptic number.

21417160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21417160 is an abundant number, since it is smaller than the sum of its proper divisors (26907440).

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

21417160 is a wasteful number, since it uses less digits than its factorization.

21417160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21417160 is about 4627.8677595627. The cubic root of 21417160 is about 277.7072985043.

Adding to 21417160 its reverse (6171412), we get a palindrome (27588572).

The spelling of 21417160 in words is "twenty-one million, four hundred seventeen thousand, one hundred sixty".