21011108 has 12 divisors (see below), whose sum is σ = 37463580. Its totient is φ = 10307232.

The previous prime is 21011083. The next prime is 21011141. The reversal of 21011108 is 80111012.

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 5345344 = 3958^2 + 2312^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011092 and 21011101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49343 + ... + 49766.

It is an arithmetic number, because the mean of its divisors is an integer number (3121965).

Almost surely, 2^21011108 is an apocalyptic number.

It is an amenable number.

21011108 is a deficient number, since it is larger than the sum of its proper divisors (16452472).

21011108 is a wasteful number, since it uses less digits than its factorization.

21011108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99166 (or 99164 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 21011108 is about 4583.7875168904. The cubic root of 21011108 is about 275.9410537141.

The spelling of 21011108 in words is "twenty-one million, eleven thousand, one hundred eight".