21112111106 has 4 divisors (see below), whose sum is σ = 31668166662. Its totient is φ = 10556055552.

The previous prime is 21112111081. The next prime is 21112111121. The reversal of 21112111106 is 60111121112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12434257081 + 8677854025 = 111509^2 + 93155^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278027775 + ... + 5278027778.

Almost surely, 2^21112111106 is an apocalyptic number.

21112111106 is a deficient number, since it is larger than the sum of its proper divisors (10556055556).

21112111106 is a wasteful number, since it uses less digits than its factorization.

21112111106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10556055555.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21112111106 its reverse (60111121112), we get a palindrome (81223232218).

The spelling of 21112111106 in words is "twenty-one billion, one hundred twelve million, one hundred eleven thousand, one hundred six".