21314345 has 16 divisors (see below), whose sum is σ = 29166480. Its totient is φ = 14813184.

The previous prime is 21314327. The next prime is 21314357. The reversal of 21314345 is 54341312.

21314345 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 8 ways, for example, as 6889 + 21307456 = 83^2 + 4616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21314345 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21314345.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8540 + ... + 10749.

It is an arithmetic number, because the mean of its divisors is an integer number (1822905).

Almost surely, 2^21314345 is an apocalyptic number.

It is an amenable number.

21314345 is a deficient number, since it is larger than the sum of its proper divisors (7852135).

21314345 is a wasteful number, since it uses less digits than its factorization.

21314345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19324.

The product of its digits is 1440, while the sum is 23.

The square root of 21314345 is about 4616.7461485336. The cubic root of 21314345 is about 277.2621992208.

Adding to 21314345 its reverse (54341312), we get a palindrome (75655657).

The spelling of 21314345 in words is "twenty-one million, three hundred fourteen thousand, three hundred forty-five".