21212222100112 has 20 divisors (see below), whose sum is σ = 41151848105340. Its totient is φ = 10592390331008.

The previous prime is 21212222100103. The next prime is 21212222100131. The reversal of 21212222100112 is 21100122221212.

It can be written as a sum of positive squares in 2 ways, for example, as 8418609402256 + 12793612697856 = 2901484^2 + 3576816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21212222100112.

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, 857532187 + ... + 857556922.

It is an arithmetic number, because the mean of its divisors is an integer number (2057592405267).

Almost surely, 2^{21212222100112} is an apocalyptic number.

It is an amenable number.

21212222100112 is a deficient number, since it is larger than the sum of its proper divisors (19939626005228).

21212222100112 is a wasteful number, since it uses less digits than its factorization.

21212222100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715089890 (or 1715089884 counting only the distinct ones).

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

Adding to 21212222100112 its reverse (21100122221212), we get a palindrome (42312344321324).

The spelling of 21212222100112 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred thousand, one hundred twelve".