21540014 has 8 divisors (see below), whose sum is σ = 32643408. Its totient is φ = 10658880.

The previous prime is 21539993. The next prime is 21540017. The reversal of 21540014 is 41004512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21539974 and 21540001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55322 + ... + 55709.

It is an arithmetic number, because the mean of its divisors is an integer number (4080426).

Almost surely, 2^21540014 is an apocalyptic number.

21540014 is a deficient number, since it is larger than the sum of its proper divisors (11103394).

21540014 is a wasteful number, since it uses less digits than its factorization.

21540014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111130.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21540014 is about 4641.1220626051. The cubic root of 21540014 is about 278.2372851169.

Adding to 21540014 its reverse (41004512), we get a palindrome (62544526).

The spelling of 21540014 in words is "twenty-one million, five hundred forty thousand, fourteen".