21140313 has 4 divisors (see below), whose sum is σ = 28187088. Its totient is φ = 14093540.

The previous prime is 21140303. The next prime is 21140341. The reversal of 21140313 is 31304112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21140313 - 2¹² = 21136217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21140292 and 21140301.

It is not an unprimeable number, because it can be changed into a prime (21140303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3523383 + ... + 3523388.

It is an arithmetic number, because the mean of its divisors is an integer number (7046772).

Almost surely, 2^21140313 is an apocalyptic number.

It is an amenable number.

21140313 is a deficient number, since it is larger than the sum of its proper divisors (7046775).

21140313 is an equidigital number, since it uses as much as digits as its factorization.

21140313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7046774.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21140313 is about 4597.8596107319. The cubic root of 21140313 is about 276.5055191301.

Adding to 21140313 its reverse (31304112), we get a palindrome (52444425).

The spelling of 21140313 in words is "twenty-one million, one hundred forty thousand, three hundred thirteen".