21112202210212 has 6 divisors (see below), whose sum is σ = 36946353867878. Its totient is φ = 10556101105104.

The previous prime is 21112202210191. The next prime is 21112202210257. The reversal of 21112202210212 is 21201220221112.

It can be written as a sum of positive squares in only one way, i.e., 20831319169956 + 280883040256 = 4564134^2 + 529984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21112202210212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639025276273 + ... + 2639025276280.

Almost surely, 2^{21112202210212} is an apocalyptic number.

It is an amenable number.

21112202210212 is a deficient number, since it is larger than the sum of its proper divisors (15834151657666).

21112202210212 is a wasteful number, since it uses less digits than its factorization.

21112202210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278050552557 (or 5278050552555 counting only the distinct ones).

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

Adding to 21112202210212 its reverse (21201220221112), we get a palindrome (42313422431324).

The spelling of 21112202210212 in words is "twenty-one trillion, one hundred twelve billion, two hundred two million, two hundred ten thousand, two hundred twelve".