21200112122212 has 6 divisors (see below), whose sum is σ = 37100196213878. Its totient is φ = 10600056061104.

The previous prime is 21200112122129. The next prime is 21200112122219. The reversal of 21200112122212 is 21222121100212.

It can be written as a sum of positive squares in only one way, i.e., 17451807031296 + 3748305090916 = 4177536^2 + 1936054^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21200112122212.

It is not an unprimeable number, because it can be changed into a prime (21200112122219) by changing a digit.

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, 2650014015273 + ... + 2650014015280.

Almost surely, 2^{21200112122212} is an apocalyptic number.

It is an amenable number.

21200112122212 is a deficient number, since it is larger than the sum of its proper divisors (15900084091666).

21200112122212 is a wasteful number, since it uses less digits than its factorization.

21200112122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300028030557 (or 5300028030555 counting only the distinct ones).

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

Adding to 21200112122212 its reverse (21222121100212), we get a palindrome (42422233222424).

The spelling of 21200112122212 in words is "twenty-one trillion, two hundred billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twelve".