21660034 has 16 divisors (see below), whose sum is σ = 35675136. Its totient is φ = 9781200.

The previous prime is 21660011. The next prime is 21660047. The reversal of 21660034 is 43006612.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21659987 and 21660014.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (2229696).

Almost surely, 2^21660034 is an apocalyptic number.

21660034 is a deficient number, since it is larger than the sum of its proper divisors (14015102).

21660034 is a wasteful number, since it uses less digits than its factorization.

21660034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21660034 is about 4654.0341640345. The cubic root of 21660034 is about 278.7531035200.

Adding to 21660034 its reverse (43006612), we get a palindrome (64666646).

The spelling of 21660034 in words is "twenty-one million, six hundred sixty thousand, thirty-four".