21062317 has 4 divisors (see below), whose sum is σ = 22170880. Its totient is φ = 19953756.

The previous prime is 21062309. The next prime is 21062339. The reversal of 21062317 is 71326012.

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 21062317 - 2³ = 21062309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062347) 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, 554253 + ... + 554290.

It is an arithmetic number, because the mean of its divisors is an integer number (5542720).

Almost surely, 2^21062317 is an apocalyptic number.

It is an amenable number.

21062317 is a deficient number, since it is larger than the sum of its proper divisors (1108563).

21062317 is a wasteful number, since it uses less digits than its factorization.

21062317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108562.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21062317 is about 4589.3700003377. The cubic root of 21062317 is about 276.1650495330.

Adding to 21062317 its reverse (71326012), we get a palindrome (92388329).

The spelling of 21062317 in words is "twenty-one million, sixty-two thousand, three hundred seventeen".