21200122212112 has 40 divisors (see below), whose sum is σ = 41222772852696. Its totient is φ = 10562016439296.

The previous prime is 21200122212091. The next prime is 21200122212149. The reversal of 21200122212112 is 21121222100212.

It can be written as a sum of positive squares in 4 ways, for example, as 6841936656 + 21193280275456 = 82716^2 + 4603616^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21200122212112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10740538 + ... + 12560230.

Almost surely, 2^{21200122212112} is an apocalyptic number.

It is an amenable number.

21200122212112 is a deficient number, since it is larger than the sum of its proper divisors (20022650640584).

21200122212112 is a wasteful number, since it uses less digits than its factorization.

21200122212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822315 (or 1822309 counting only the distinct ones).

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

Adding to 21200122212112 its reverse (21121222100212), we get a palindrome (42321344312324).

The spelling of 21200122212112 in words is "twenty-one trillion, two hundred billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twelve".