21307314 has 16 divisors (see below), whose sum is σ = 48702528. Its totient is φ = 6087792.

The previous prime is 21307283. The next prime is 21307333. The reversal of 21307314 is 41370312.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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, 253617 + ... + 253700.

It is an arithmetic number, because the mean of its divisors is an integer number (3043908).

Almost surely, 2^21307314 is an apocalyptic number.

21307314 is an abundant number, since it is smaller than the sum of its proper divisors (27395214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21307314 is a wasteful number, since it uses less digits than its factorization.

21307314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507329.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21307314 is about 4615.9846186919. The cubic root of 21307314 is about 277.2317088802.

Adding to 21307314 its reverse (41370312), we get a palindrome (62677626).

The spelling of 21307314 in words is "twenty-one million, three hundred seven thousand, three hundred fourteen".