20121101221212 has 36 divisors (see below), whose sum is σ = 52745438183256. Its totient is φ = 6707033740080.

The previous prime is 20121101221147. The next prime is 20121101221231. The reversal of 20121101221212 is 21212210112102.

20121101221212 is a `hidden beast` number, since 20 + 1 + 211 + 0 + 1 + 221 + 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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10350359739 + ... + 10350361682.

It is an arithmetic number, because the mean of its divisors is an integer number (1465151060646).

Almost surely, 2^{20121101221212} is an apocalyptic number.

It is an amenable number.

20121101221212 is an abundant number, since it is smaller than the sum of its proper divisors (32624336962044).

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

20121101221212 is a wasteful number, since it uses less digits than its factorization.

20121101221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20700721440 (or 20700721426 counting only the distinct ones).

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

Adding to 20121101221212 its reverse (21212210112102), we get a palindrome (41333311333314).

The spelling of 20121101221212 in words is "twenty trillion, one hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred twelve".