21200120112012 has 48 divisors (see below), whose sum is σ = 49486701261312. Its totient is φ = 7063885259200.

The previous prime is 21200120112007. The next prime is 21200120112029. The reversal of 21200120112012 is 21021102100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200120111982 and 21200120112000.

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 15 ways as a sum of consecutive naturals, for example, 326620762 + ... + 326685662.

It is an arithmetic number, because the mean of its divisors is an integer number (1030972942944).

Almost surely, 2^{21200120112012} is an apocalyptic number.

It is an amenable number.

21200120112012 is an abundant number, since it is smaller than the sum of its proper divisors (28286581149300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200120112012 is a wasteful number, since it uses less digits than its factorization.

21200120112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75358 (or 75356 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200120112012 its reverse (21021102100212), we get a palindrome (42221222212224).

The spelling of 21200120112012 in words is "twenty-one trillion, two hundred billion, one hundred twenty million, one hundred twelve thousand, twelve".