21000598 has 16 divisors (see below), whose sum is σ = 32533776. Its totient is φ = 10160640.

The previous prime is 21000589. The next prime is 21000599. The reversal of 21000598 is 89500012.

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, 8638 + ... + 10798.

It is an arithmetic number, because the mean of its divisors is an integer number (2033361).

Almost surely, 2^21000598 is an apocalyptic number.

21000598 is a deficient number, since it is larger than the sum of its proper divisors (11533178).

21000598 is a wasteful number, since it uses less digits than its factorization.

21000598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 21000598 is about 4582.6409416405. The cubic root of 21000598 is about 275.8950364016.

The spelling of 21000598 in words is "twenty-one million, five hundred ninety-eight", and thus it is an aban number.