21160147 has 4 divisors (see below), whose sum is σ = 21195280. Its totient is φ = 21125016.

The previous prime is 21160123. The next prime is 21160151. The reversal of 21160147 is 74106112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21160147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21160157) 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 3 ways as a sum of consecutive naturals, for example, 16647 + ... + 17872.

It is an arithmetic number, because the mean of its divisors is an integer number (5298820).

Almost surely, 2^21160147 is an apocalyptic number.

21160147 is a deficient number, since it is larger than the sum of its proper divisors (35133).

21160147 is an equidigital number, since it uses as much as digits as its factorization.

21160147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35132.

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

The square root of 21160147 is about 4600.0159782331. The cubic root of 21160147 is about 276.5919652839.

Adding to 21160147 its reverse (74106112), we get a palindrome (95266259).

The spelling of 21160147 in words is "twenty-one million, one hundred sixty thousand, one hundred forty-seven".