21083597 has 4 divisors (see below), whose sum is σ = 22193280. Its totient is φ = 19973916.

The previous prime is 21083593. The next prime is 21083611. The reversal of 21083597 is 79538012.

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 21083597 - 2² = 21083593 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 (21083593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554813 + ... + 554850.

It is an arithmetic number, because the mean of its divisors is an integer number (5548320).

Almost surely, 2^21083597 is an apocalyptic number.

It is an amenable number.

21083597 is a deficient number, since it is larger than the sum of its proper divisors (1109683).

21083597 is a wasteful number, since it uses less digits than its factorization.

21083597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109682.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 21083597 is about 4591.6878160432. The cubic root of 21083597 is about 276.2580246504.

The spelling of 21083597 in words is "twenty-one million, eighty-three thousand, five hundred ninety-seven".