14640021 has 24 divisors (see below), whose sum is σ = 23927904. Its totient is φ = 8871120.

The previous prime is 14639971. The next prime is 14640023. The reversal of 14640021 is 12004641.

14640021 is a `hidden beast` number, since 1 + 4 + 640 + 0 + 21 = 666.

It is not a de Polignac number, because 14640021 - 2⁷ = 14639893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 14639976 and 14640003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14640023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (996996).

Almost surely, 2^14640021 is an apocalyptic number.

14640021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

14640021 is a deficient number, since it is larger than the sum of its proper divisors (9287883).

14640021 is an equidigital number, since it uses as much as digits as its factorization.

14640021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5503 (or 5491 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 14640021 is about 3826.2280381598. The cubic root of 14640021 is about 244.6323571075.

Adding to 14640021 its reverse (12004641), we get a palindrome (26644662).

The spelling of 14640021 in words is "fourteen million, six hundred forty thousand, twenty-one".