21617106 has 32 divisors (see below), whose sum is σ = 51007488. Its totient is φ = 5976720.

The previous prime is 21617053. The next prime is 21617111. The reversal of 21617106 is 60171612.

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 15 ways as a sum of consecutive naturals, for example, 7000 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (1593984).

Almost surely, 2^21617106 is an apocalyptic number.

21617106 is an abundant number, since it is smaller than the sum of its proper divisors (29390382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21617106 is a wasteful number, since it uses less digits than its factorization.

21617106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16646.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21617106 is about 4649.4199638234. The cubic root of 21617106 is about 278.5688282278.

Adding to 21617106 its reverse (60171612), we get a palindrome (81788718).

The spelling of 21617106 in words is "twenty-one million, six hundred seventeen thousand, one hundred six".