20120112121212 has 36 divisors (see below), whose sum is σ = 51818779335960. Its totient is φ = 6580162454112.

The previous prime is 20120112121211. The next prime is 20120112121337. The reversal of 20120112121212 is 21212121102102.

20120112121212 is a `hidden beast` number, since 201 + 20 + 112 + 121 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120112121211) 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 in 11 ways as a sum of consecutive naturals, for example, 5272564162 + ... + 5272567977.

It is an arithmetic number, because the mean of its divisors is an integer number (1439410537110).

Almost surely, 2^{20120112121212} is an apocalyptic number.

It is an amenable number.

20120112121212 is an abundant number, since it is smaller than the sum of its proper divisors (31698667214748).

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

20120112121212 is a wasteful number, since it uses less digits than its factorization.

20120112121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10545132202 (or 10545132197 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20120112121212 its reverse (21212121102102), we get a palindrome (41332233223314).

The spelling of 20120112121212 in words is "twenty trillion, one hundred twenty billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twelve".