21516113 has 8 divisors (see below), whose sum is σ = 22787520. Its totient is φ = 20258640.

The previous prime is 21516071. The next prime is 21516119. The reversal of 21516113 is 31161512.

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

It is a cyclic number.

It is not a de Polignac number, because 21516113 - 2¹² = 21512017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21516119) 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, 218 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (2848440).

Almost surely, 2^21516113 is an apocalyptic number.

It is an amenable number.

21516113 is a deficient number, since it is larger than the sum of its proper divisors (1271407).

21516113 is a wasteful number, since it uses less digits than its factorization.

21516113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6967.

The product of its digits is 180, while the sum is 20.

The square root of 21516113 is about 4638.5464318038. The cubic root of 21516113 is about 278.1343354692.

Adding to 21516113 its reverse (31161512), we get a palindrome (52677625).

The spelling of 21516113 in words is "twenty-one million, five hundred sixteen thousand, one hundred thirteen".