21211106 has 32 divisors (see below), whose sum is σ = 39951360. Its totient is φ = 8235216.

The previous prime is 21211079. The next prime is 21211109. The reversal of 21211106 is 60111212.

It is a super-2 number, since 2×21211106² = 899822035486472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 15 ways as a sum of consecutive naturals, for example, 4385 + ... + 7851.

It is an arithmetic number, because the mean of its divisors is an integer number (1248480).

Almost surely, 2^21211106 is an apocalyptic number.

21211106 is a deficient number, since it is larger than the sum of its proper divisors (18740254).

21211106 is a wasteful number, since it uses less digits than its factorization.

21211106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 21211106 is about 4605.5516499112. The cubic root of 21211106 is about 276.8138218147.

Adding to 21211106 its reverse (60111212), we get a palindrome (81322318).

The spelling of 21211106 in words is "twenty-one million, two hundred eleven thousand, one hundred six".