21111120222112 has 24 divisors (see below), whose sum is σ = 41562626073696. Its totient is φ = 10555532647872.

The previous prime is 21111120222107. The next prime is 21111120222131. The reversal of 21111120222112 is 21122202111112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111120222112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18025803 + ... + 19161205.

It is an arithmetic number, because the mean of its divisors is an integer number (1731776086404).

Almost surely, 2^{21111120222112} is an apocalyptic number.

It is an amenable number.

21111120222112 is a deficient number, since it is larger than the sum of its proper divisors (20451505851584).

21111120222112 is a wasteful number, since it uses less digits than its factorization.

21111120222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716460 (or 1716452 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21111120222112 its reverse (21122202111112), we get a palindrome (42233322333224).

The spelling of 21111120222112 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, two hundred twenty-two thousand, one hundred twelve".