21610105 has 8 divisors (see below), whose sum is σ = 28289664. Its totient is φ = 15716400.

The previous prime is 21610103. The next prime is 21610151. The reversal of 21610105 is 50101612.

It is a happy number.

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

It is not a de Polignac number, because 21610105 - 2¹ = 21610103 is a prime.

It is a super-2 number, since 2×21610105² = 933993276222050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21610103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196401 + ... + 196510.

It is an arithmetic number, because the mean of its divisors is an integer number (3536208).

Almost surely, 2^21610105 is an apocalyptic number.

It is an amenable number.

21610105 is a deficient number, since it is larger than the sum of its proper divisors (6679559).

21610105 is a wasteful number, since it uses less digits than its factorization.

21610105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392927.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21610105 is about 4648.6670132415. The cubic root of 21610105 is about 278.5387521861.

Adding to 21610105 its reverse (50101612), we get a palindrome (71711717).

The spelling of 21610105 in words is "twenty-one million, six hundred ten thousand, one hundred five".