21840014 has 12 divisors (see below), whose sum is σ = 37470024. Its totient is φ = 9352512.

The previous prime is 21839989. The next prime is 21840023. The reversal of 21840014 is 41004812.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16862 + ... + 18110.

It is an arithmetic number, because the mean of its divisors is an integer number (3122502).

Almost surely, 2^21840014 is an apocalyptic number.

21840014 is a deficient number, since it is larger than the sum of its proper divisors (15630010).

21840014 is an frugal number, since it uses more digits than its factorization.

21840014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21840014 is about 4673.3300760807. The cubic root of 21840014 is about 279.5230570999.

Adding to 21840014 its reverse (41004812), we get a palindrome (62844826).

The spelling of 21840014 in words is "twenty-one million, eight hundred forty thousand, fourteen".