21312314 has 16 divisors (see below), whose sum is σ = 33250560. Its totient is φ = 10234080.

The previous prime is 21312299. The next prime is 21312323. The reversal of 21312314 is 41321312.

It is a junction number, because it is equal to n+sod(n) for n = 21312292 and 21312301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7382 + ... + 9854.

It is an arithmetic number, because the mean of its divisors is an integer number (2078160).

Almost surely, 2^21312314 is an apocalyptic number.

21312314 is a deficient number, since it is larger than the sum of its proper divisors (11938246).

21312314 is a wasteful number, since it uses less digits than its factorization.

21312314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645.

The product of its digits is 144, while the sum is 17.

The square root of 21312314 is about 4616.5261831815. The cubic root of 21312314 is about 277.2533923599.

Adding to 21312314 its reverse (41321312), we get a palindrome (62633626).

The spelling of 21312314 in words is "twenty-one million, three hundred twelve thousand, three hundred fourteen".