21152834 has 8 divisors (see below), whose sum is σ = 32043708. Its totient is φ = 10471600.

The previous prime is 21152797. The next prime is 21152849. The reversal of 21152834 is 43825112.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 38809 = 4595^2 + 197^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52157 + ... + 52560.

Almost surely, 2^21152834 is an apocalyptic number.

21152834 is a deficient number, since it is larger than the sum of its proper divisors (10890874).

21152834 is a wasteful number, since it uses less digits than its factorization.

21152834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104820.

The product of its digits is 1920, while the sum is 26.

The square root of 21152834 is about 4599.2210209991. The cubic root of 21152834 is about 276.5600979863.

Adding to 21152834 its reverse (43825112), we get a palindrome (64977946).

The spelling of 21152834 in words is "twenty-one million, one hundred fifty-two thousand, eight hundred thirty-four".