21542160 has 40 divisors (see below), whose sum is σ = 66781440. Its totient is φ = 5744512.

The previous prime is 21542159. The next prime is 21542161. The reversal of 21542160 is 6124512.

It is an interprime number because it is at equal distance from previous prime (21542159) and next prime (21542161).

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

It is not an unprimeable number, because it can be changed into a prime (21542161) 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, 44640 + ... + 45119.

It is an arithmetic number, because the mean of its divisors is an integer number (1669536).

Almost surely, 2^21542160 is an apocalyptic number.

21542160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21542160 is an abundant number, since it is smaller than the sum of its proper divisors (45239280).

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

21542160 is a wasteful number, since it uses less digits than its factorization.

21542160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89775 (or 89769 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21542160 is about 4641.3532509388. The cubic root of 21542160 is about 278.2465249342.

Adding to 21542160 its reverse (6124512), we get a palindrome (27666672).

The spelling of 21542160 in words is "twenty-one million, five hundred forty-two thousand, one hundred sixty".