21200597 has 4 divisors (see below), whose sum is σ = 23127936. Its totient is φ = 19273260.

The previous prime is 21200579. The next prime is 21200603. The reversal of 21200597 is 79500212.

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 21200597 - 2⁶ = 21200533 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 (21200507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963653 + ... + 963674.

It is an arithmetic number, because the mean of its divisors is an integer number (5781984).

Almost surely, 2^21200597 is an apocalyptic number.

It is an amenable number.

21200597 is a deficient number, since it is larger than the sum of its proper divisors (1927339).

21200597 is a wasteful number, since it uses less digits than its factorization.

21200597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927338.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21200597 is about 4604.4106028894. The cubic root of 21200597 is about 276.7680986448.

The spelling of 21200597 in words is "twenty-one million, two hundred thousand, five hundred ninety-seven".