21118834 has 8 divisors (see below), whose sum is σ = 34558128. Its totient is φ = 9599460.

The previous prime is 21118829. The next prime is 21118841. The reversal of 21118834 is 43881112.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479952 + ... + 479995.

It is an arithmetic number, because the mean of its divisors is an integer number (4319766).

Almost surely, 2^21118834 is an apocalyptic number.

21118834 is a deficient number, since it is larger than the sum of its proper divisors (13439294).

21118834 is a wasteful number, since it uses less digits than its factorization.

21118834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959960.

The product of its digits is 1536, while the sum is 28.

The square root of 21118834 is about 4595.5232563877. The cubic root of 21118834 is about 276.4118422675.

Adding to 21118834 its reverse (43881112), we get a palindrome (64999946).

It can be divided in two parts, 21118 and 834, that added together give a cube (21952 = 28³).

The spelling of 21118834 in words is "twenty-one million, one hundred eighteen thousand, eight hundred thirty-four".