20121111001212 has 48 divisors (see below), whose sum is σ = 50576003079840. Its totient is φ = 6189242185728.

The previous prime is 20121111001207. The next prime is 20121111001253. The reversal of 20121111001212 is 21210011112102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20121111001191 and 20121111001200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18949137 + ... + 19982792.

It is an arithmetic number, because the mean of its divisors is an integer number (1053666730830).

Almost surely, 2^{20121111001212} is an apocalyptic number.

It is an amenable number.

20121111001212 is an abundant number, since it is smaller than the sum of its proper divisors (30454892078628).

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

20121111001212 is a wasteful number, since it uses less digits than its factorization.

20121111001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38935262 (or 38935260 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20121111001212 its reverse (21210011112102), we get a palindrome (41331122113314).

The spelling of 20121111001212 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, one thousand, two hundred twelve".