21530014 has 24 divisors (see below), whose sum is σ = 36340920. Its totient is φ = 9554160.

The previous prime is 21529997. The next prime is 21530017. The reversal of 21530014 is 41003512.

It is a self number, because there is not a number n which added to its sum of digits gives 21530014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9372 + ... + 11440.

It is an arithmetic number, because the mean of its divisors is an integer number (1514205).

Almost surely, 2^21530014 is an apocalyptic number.

21530014 is a deficient number, since it is larger than the sum of its proper divisors (14810906).

21530014 is a wasteful number, since it uses less digits than its factorization.

21530014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21530014 is about 4640.0446118545. The cubic root of 21530014 is about 278.1942210233.

Adding to 21530014 its reverse (41003512), we get a palindrome (62533526).

It can be divided in two parts, 21 and 530014, that added together give a palindrome (530035).

The spelling of 21530014 in words is "twenty-one million, five hundred thirty thousand, fourteen".