21011106 has 16 divisors (see below), whose sum is σ = 43047648. Its totient is φ = 6832800.

The previous prime is 21011083. The next prime is 21011141. The reversal of 21011106 is 60111012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21011091 and 21011100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42460 + ... + 42951.

It is an arithmetic number, because the mean of its divisors is an integer number (2690478).

Almost surely, 2^21011106 is an apocalyptic number.

21011106 is an abundant number, since it is smaller than the sum of its proper divisors (22036542).

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

21011106 is a wasteful number, since it uses less digits than its factorization.

21011106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85457.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 21011106 is about 4583.7872987302. The cubic root of 21011106 is about 275.9410449587.

Adding to 21011106 its reverse (60111012), we get a palindrome (81122118).

The spelling of 21011106 in words is "twenty-one million, eleven thousand, one hundred six".