21440314 has 16 divisors (see below), whose sum is σ = 36848448. Its totient is φ = 9165312.

The previous prime is 21440291. The next prime is 21440317. The reversal of 21440314 is 41304412.

It is a junction number, because it is equal to n+sod(n) for n = 21440291 and 21440300.

It is not an unprimeable number, because it can be changed into a prime (21440317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4474 + ... + 7930.

It is an arithmetic number, because the mean of its divisors is an integer number (2303028).

Almost surely, 2^21440314 is an apocalyptic number.

21440314 is a deficient number, since it is larger than the sum of its proper divisors (15408134).

21440314 is a wasteful number, since it uses less digits than its factorization.

21440314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21440314 is about 4630.3686678276. The cubic root of 21440314 is about 277.8073385193.

Adding to 21440314 its reverse (41304412), we get a palindrome (62744726).

The spelling of 21440314 in words is "twenty-one million, four hundred forty thousand, three hundred fourteen".