21149327 has 4 divisors (see below), whose sum is σ = 21417120. Its totient is φ = 20881536.

The previous prime is 21149321. The next prime is 21149333. The reversal of 21149327 is 72394112.

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

It is an interprime number because it is at equal distance from previous prime (21149321) and next prime (21149333).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21149327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21149327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149321) 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 3 ways as a sum of consecutive naturals, for example, 133778 + ... + 133935.

It is an arithmetic number, because the mean of its divisors is an integer number (5354280).

Almost surely, 2^21149327 is an apocalyptic number.

21149327 is a deficient number, since it is larger than the sum of its proper divisors (267793).

21149327 is an equidigital number, since it uses as much as digits as its factorization.

21149327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267792.

The product of its digits is 3024, while the sum is 29.

The square root of 21149327 is about 4598.8397449792. The cubic root of 21149327 is about 276.5448131964.

The spelling of 21149327 in words is "twenty-one million, one hundred forty-nine thousand, three hundred twenty-seven".