21146163 has 4 divisors (see below), whose sum is σ = 28194888. Its totient is φ = 14097440.

The previous prime is 21146161. The next prime is 21146171. The reversal of 21146163 is 36164112.

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

It is a cyclic number.

It is not a de Polignac number, because 21146163 - 2¹ = 21146161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21146161) 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, 3524358 + ... + 3524363.

It is an arithmetic number, because the mean of its divisors is an integer number (7048722).

Almost surely, 2^21146163 is an apocalyptic number.

21146163 is a deficient number, since it is larger than the sum of its proper divisors (7048725).

21146163 is an equidigital number, since it uses as much as digits as its factorization.

21146163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7048724.

The product of its digits is 864, while the sum is 24.

The square root of 21146163 is about 4598.4957323020. The cubic root of 21146163 is about 276.5310218762.

The spelling of 21146163 in words is "twenty-one million, one hundred forty-six thousand, one hundred sixty-three".