21648327 has 16 divisors (see below), whose sum is σ = 31142880. Its totient is φ = 13325312.

The previous prime is 21648317. The next prime is 21648337. The reversal of 21648327 is 72384612.

It is an interprime number because it is at equal distance from previous prime (21648317) and next prime (21648337).

It is a cyclic number.

It is not a de Polignac number, because 21648327 - 2⁴ = 21648311 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648317) 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 15 ways as a sum of consecutive naturals, for example, 1302 + ... + 6707.

It is an arithmetic number, because the mean of its divisors is an integer number (1946430).

Almost surely, 2^21648327 is an apocalyptic number.

21648327 is a deficient number, since it is larger than the sum of its proper divisors (9494553).

21648327 is a wasteful number, since it uses less digits than its factorization.

21648327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8082.

The product of its digits is 16128, while the sum is 33.

The square root of 21648327 is about 4652.7762679931. The cubic root of 21648327 is about 278.7028735174.

The spelling of 21648327 in words is "twenty-one million, six hundred forty-eight thousand, three hundred twenty-seven".