21021111106 has 16 divisors (see below), whose sum is σ = 32793805440. Its totient is φ = 10097034480.

The previous prime is 21021111049. The next prime is 21021111131. The reversal of 21021111106 is 60111112012.

It is a super-2 number, since 2×21021111106² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21021111106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1792060 + ... + 1803751.

It is an arithmetic number, because the mean of its divisors is an integer number (2049612840).

Almost surely, 2^21021111106 is an apocalyptic number.

21021111106 is a deficient number, since it is larger than the sum of its proper divisors (11772694334).

21021111106 is a wasteful number, since it uses less digits than its factorization.

21021111106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595929.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21021111106 its reverse (60111112012), we get a palindrome (81132223118).

The spelling of 21021111106 in words is "twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred six".