21034689 has 8 divisors (see below), whose sum is σ = 30203712. Its totient is φ = 12944400.

The previous prime is 21034687. The next prime is 21034723. The reversal of 21034689 is 98643012.

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

It is not a de Polignac number, because 21034689 - 2¹ = 21034687 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21034687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269637 + ... + 269714.

It is an arithmetic number, because the mean of its divisors is an integer number (3775464).

Almost surely, 2^21034689 is an apocalyptic number.

It is an amenable number.

21034689 is a deficient number, since it is larger than the sum of its proper divisors (9169023).

21034689 is a wasteful number, since it uses less digits than its factorization.

21034689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539367.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21034689 is about 4586.3590134223. The cubic root of 21034689 is about 276.0442456896.

The spelling of 21034689 in words is "twenty-one million, thirty-four thousand, six hundred eighty-nine".