21102222021112 has 8 divisors (see below), whose sum is σ = 39566666289600. Its totient is φ = 10551111010552.

The previous prime is 21102222021107. The next prime is 21102222021157. The reversal of 21102222021112 is 21112022220112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21102222021112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318888876312 + ... + 1318888876327.

It is an arithmetic number, because the mean of its divisors is an integer number (4945833286200).

Almost surely, 2^{21102222021112} is an apocalyptic number.

It is an amenable number.

21102222021112 is a deficient number, since it is larger than the sum of its proper divisors (18464444268488).

21102222021112 is a wasteful number, since it uses less digits than its factorization.

21102222021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637777752645 (or 2637777752641 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21102222021112 its reverse (21112022220112), we get a palindrome (42214244241224).

The spelling of 21102222021112 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-two million, twenty-one thousand, one hundred twelve".