21616334 has 8 divisors (see below), whose sum is σ = 33114528. Its totient is φ = 10578160.

The previous prime is 21616327. The next prime is 21616337. The reversal of 21616334 is 43361612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114887 + ... + 115074.

It is an arithmetic number, because the mean of its divisors is an integer number (4139316).

Almost surely, 2^21616334 is an apocalyptic number.

21616334 is a deficient number, since it is larger than the sum of its proper divisors (11498194).

21616334 is a wasteful number, since it uses less digits than its factorization.

21616334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230010.

The product of its digits is 2592, while the sum is 26.

The square root of 21616334 is about 4649.3369419736. The cubic root of 21616334 is about 278.5655120624.

Adding to 21616334 its reverse (43361612), we get a palindrome (64977946).

The spelling of 21616334 in words is "twenty-one million, six hundred sixteen thousand, three hundred thirty-four".