21083413 has 8 divisors (see below), whose sum is σ = 22793400. Its totient is φ = 19386048.

The previous prime is 21083399. The next prime is 21083429. The reversal of 21083413 is 31438012.

It can be written as a sum of positive squares in 4 ways, for example, as 815409 + 20268004 = 903^2 + 4502^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21083413 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 (21083443) 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 7 ways as a sum of consecutive naturals, for example, 483 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (2849175).

Almost surely, 2^21083413 is an apocalyptic number.

It is an amenable number.

21083413 is a deficient number, since it is larger than the sum of its proper divisors (1709987).

21083413 is a wasteful number, since it uses less digits than its factorization.

21083413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21083413 is about 4591.6677797942. The cubic root of 21083413 is about 276.2572209984.

The spelling of 21083413 in words is "twenty-one million, eighty-three thousand, four hundred thirteen".