20121101201212 has 72 divisors (see below), whose sum is σ = 39568260291840. Its totient is φ = 8942131783200.

The previous prime is 20121101201189. The next prime is 20121101201213. The reversal of 20121101201212 is 21210210112102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121101201213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21632839 + ... + 22543777.

It is an arithmetic number, because the mean of its divisors is an integer number (549559170720).

Almost surely, 2^{20121101201212} is an apocalyptic number.

20121101201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20121101201212 is a deficient number, since it is larger than the sum of its proper divisors (19447159090628).

20121101201212 is a wasteful number, since it uses less digits than its factorization.

20121101201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911983 (or 911970 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121101201212 its reverse (21210210112102), we get a palindrome (41331311313314).

The spelling of 20121101201212 in words is "twenty trillion, one hundred twenty-one billion, one hundred one million, two hundred one thousand, two hundred twelve".