21240314 has 4 divisors (see below), whose sum is σ = 31860474. Its totient is φ = 10620156.

The previous prime is 21240313. The next prime is 21240377. The reversal of 21240314 is 41304212.

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

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 218089 = 4585^2 + 467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21240292 and 21240301.

It is not an unprimeable number, because it can be changed into a prime (21240311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310077 + ... + 5310080.

Almost surely, 2^21240314 is an apocalyptic number.

21240314 is a deficient number, since it is larger than the sum of its proper divisors (10620160).

21240314 is a wasteful number, since it uses less digits than its factorization.

21240314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620159.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21240314 is about 4608.7215146936. The cubic root of 21240314 is about 276.9408224185.

Adding to 21240314 its reverse (41304212), we get a palindrome (62544526).

The spelling of 21240314 in words is "twenty-one million, two hundred forty thousand, three hundred fourteen".