21214313 has 4 divisors (see below), whose sum is σ = 21369300. Its totient is φ = 21059328.

The previous prime is 21214309. The next prime is 21214321. The reversal of 21214313 is 31341212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18003049 + 3211264 = 4243^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214313 - 2² = 21214309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21214291 and 21214300.

It is not an unprimeable number, because it can be changed into a prime (21214373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77288 + ... + 77561.

It is an arithmetic number, because the mean of its divisors is an integer number (5342325).

Almost surely, 2^21214313 is an apocalyptic number.

It is an amenable number.

21214313 is a deficient number, since it is larger than the sum of its proper divisors (154987).

21214313 is a wasteful number, since it uses less digits than its factorization.

21214313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154986.

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

The square root of 21214313 is about 4605.8998035129. The cubic root of 21214313 is about 276.8277720097.

Adding to 21214313 its reverse (31341212), we get a palindrome (52555525).

The spelling of 21214313 in words is "twenty-one million, two hundred fourteen thousand, three hundred thirteen".