21211122211112 has 16 divisors (see below), whose sum is σ = 39883519460340. Its totient is φ = 10575517021696.

The previous prime is 21211122211087. The next prime is 21211122211127. The reversal of 21211122211112 is 21111222111212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18633087359236 + 2578034851876 = 4316606^2 + 1605626^2 .

It is a nude number because it is divisible by every one of its digits.

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, 3755507483 + ... + 3755513130.

Almost surely, 2^{21211122211112} is an apocalyptic number.

It is an amenable number.

21211122211112 is a deficient number, since it is larger than the sum of its proper divisors (18672397249228).

21211122211112 is a wasteful number, since it uses less digits than its factorization.

21211122211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7511020972 (or 7511020968 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 21211122211112 its reverse (21111222111212), we get a palindrome (42322344322324).

The spelling of 21211122211112 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred eleven thousand, one hundred twelve".