21211108 has 12 divisors (see below), whose sum is σ = 37642752. Its totient is φ = 10456040.

The previous prime is 21211079. The next prime is 21211109. The reversal of 21211108 is 80111212.

It is a super-2 number, since 2×21211108² = 899822205175328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211091 and 21211100.

It is not an unprimeable number, because it can be changed into a prime (21211109) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 37060 + ... + 37627.

It is an arithmetic number, because the mean of its divisors is an integer number (3136896).

Almost surely, 2^21211108 is an apocalyptic number.

It is an amenable number.

21211108 is a deficient number, since it is larger than the sum of its proper divisors (16431644).

21211108 is a wasteful number, since it uses less digits than its factorization.

21211108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74762 (or 74760 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 21211108 is about 4605.5518670405. The cubic root of 21211108 is about 276.8138305150.

The spelling of 21211108 in words is "twenty-one million, two hundred eleven thousand, one hundred eight".