21105106 has 8 divisors (see below), whose sum is σ = 34535664. Its totient is φ = 9593220.

The previous prime is 21105047. The next prime is 21105107. The reversal of 21105106 is 60150112.

It is a happy number.

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 21105106.

It is not an unprimeable number, because it can be changed into a prime (21105107) 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, 479640 + ... + 479683.

It is an arithmetic number, because the mean of its divisors is an integer number (4316958).

Almost surely, 2^21105106 is an apocalyptic number.

21105106 is a deficient number, since it is larger than the sum of its proper divisors (13430558).

21105106 is a wasteful number, since it uses less digits than its factorization.

21105106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959336.

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

The square root of 21105106 is about 4594.0293860619. The cubic root of 21105106 is about 276.3519367463.

Adding to 21105106 its reverse (60150112), we get a palindrome (81255218).

The spelling of 21105106 in words is "twenty-one million, one hundred five thousand, one hundred six".