21000597 has 8 divisors (see below), whose sum is σ = 28289856. Its totient is φ = 13855872.

The previous prime is 21000589. The next prime is 21000599. The reversal of 21000597 is 79500012.

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

It is not a de Polignac number, because 21000597 - 2³ = 21000589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35793 + ... + 36374.

It is an arithmetic number, because the mean of its divisors is an integer number (3536232).

Almost surely, 2^21000597 is an apocalyptic number.

It is an amenable number.

21000597 is a deficient number, since it is larger than the sum of its proper divisors (7289259).

21000597 is an equidigital number, since it uses as much as digits as its factorization.

21000597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72267.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 21000597 is about 4582.6408325331. The cubic root of 21000597 is about 275.8950320224.

The spelling of 21000597 in words is "twenty-one million, five hundred ninety-seven", and thus it is an aban number.