21246867 has 20 divisors (see below), whose sum is σ = 32420256. Its totient is φ = 13860720.

The previous prime is 21246857. The next prime is 21246893. The reversal of 21246867 is 76864212.

It is not a de Polignac number, because 21246867 - 2⁴ = 21246851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21246817) 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 19 ways as a sum of consecutive naturals, for example, 1017 + ... + 6597.

Almost surely, 2^21246867 is an apocalyptic number.

21246867 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21246867 is a deficient number, since it is larger than the sum of its proper divisors (11173389).

21246867 is an equidigital number, since it uses as much as digits as its factorization.

21246867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5640 (or 5631 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 21246867 is about 4609.4323945579. The cubic root of 21246867 is about 276.9692998163.

The spelling of 21246867 in words is "twenty-one million, two hundred forty-six thousand, eight hundred sixty-seven".