21597034 has 16 divisors (see below), whose sum is σ = 34246080. Its totient is φ = 10186560.

The previous prime is 21597031. The next prime is 21597041. The reversal of 21597034 is 43079512.

It is a junction number, because it is equal to n+sod(n) for n = 21596987 and 21597005.

It is not an unprimeable number, because it can be changed into a prime (21597031) 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, 8914 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (2140380).

Almost surely, 2^21597034 is an apocalyptic number.

21597034 is a deficient number, since it is larger than the sum of its proper divisors (12649046).

21597034 is a wasteful number, since it uses less digits than its factorization.

21597034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21597034 is about 4647.2609136996. The cubic root of 21597034 is about 278.4825822550.

The spelling of 21597034 in words is "twenty-one million, five hundred ninety-seven thousand, thirty-four".