21840327 has 16 divisors (see below), whose sum is σ = 32544000. Its totient is φ = 14475672.

The previous prime is 21840319. The next prime is 21840361. The reversal of 21840327 is 72304812.

It is not a de Polignac number, because 21840327 - 2³ = 21840319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21840327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2574 + ... + 7092.

It is an arithmetic number, because the mean of its divisors is an integer number (2034000).

Almost surely, 2^21840327 is an apocalyptic number.

21840327 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21840327 is a deficient number, since it is larger than the sum of its proper divisors (10703673).

21840327 is a wasteful number, since it uses less digits than its factorization.

21840327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4707 (or 4701 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21840327 is about 4673.3635638585. The cubic root of 21840327 is about 279.5243924210.

The spelling of 21840327 in words is "twenty-one million, eight hundred forty thousand, three hundred twenty-seven".