21442160 has 40 divisors (see below), whose sum is σ = 50048880. Its totient is φ = 8543232.

The previous prime is 21442159. The next prime is 21442163. The reversal of 21442160 is 6124412.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34331 + ... + 34949.

It is an arithmetic number, because the mean of its divisors is an integer number (1251222).

Almost surely, 2^21442160 is an apocalyptic number.

21442160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442160 is an abundant number, since it is smaller than the sum of its proper divisors (28606720).

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

21442160 is a wasteful number, since it uses less digits than its factorization.

21442160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21442160 is about 4630.5679997167. The cubic root of 21442160 is about 277.8153113134.

Adding to 21442160 its reverse (6124412), we get a palindrome (27566572).

The spelling of 21442160 in words is "twenty-one million, four hundred forty-two thousand, one hundred sixty".