21516046 has 8 divisors (see below), whose sum is σ = 33315264. Its totient is φ = 10410960.

The previous prime is 21516041. The next prime is 21516071. The reversal of 21516046 is 64061512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21516046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516041) 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 3 ways as a sum of consecutive naturals, for example, 173455 + ... + 173578.

It is an arithmetic number, because the mean of its divisors is an integer number (4164408).

Almost surely, 2^21516046 is an apocalyptic number.

21516046 is a deficient number, since it is larger than the sum of its proper divisors (11799218).

21516046 is a wasteful number, since it uses less digits than its factorization.

21516046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347066.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21516046 is about 4638.5392097082. The cubic root of 21516046 is about 278.1340467705.

Adding to 21516046 its reverse (64061512), we get a palindrome (85577558).

It can be divided in two parts, 215 and 16046, that added together give a palindrome (16261).

The spelling of 21516046 in words is "twenty-one million, five hundred sixteen thousand, forty-six".