21097163 has 8 divisors (see below), whose sum is σ = 22266000. Its totient is φ = 19934208.

The previous prime is 21097159. The next prime is 21097171. The reversal of 21097163 is 36179012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21097163 - 2² = 21097159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21097103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7295 + ... + 9767.

It is an arithmetic number, because the mean of its divisors is an integer number (2783250).

Almost surely, 2^21097163 is an apocalyptic number.

21097163 is a deficient number, since it is larger than the sum of its proper divisors (1168837).

21097163 is a wasteful number, since it uses less digits than its factorization.

21097163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21097163 is about 4593.1648130673. The cubic root of 21097163 is about 276.3172636382.

The spelling of 21097163 in words is "twenty-one million, ninety-seven thousand, one hundred sixty-three".