20121100322312 has 64 divisors (see below), whose sum is σ = 42047407411200. Its totient is φ = 8948179359040.

The previous prime is 20121100322311. The next prime is 20121100322329. The reversal of 20121100322312 is 21322300112102.

It is not an unprimeable number, because it can be changed into a prime (20121100322311) by changing a digit.

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, 10796513 + ... + 12522255.

It is an arithmetic number, because the mean of its divisors is an integer number (656990740800).

Almost surely, 2^{20121100322312} is an apocalyptic number.

20121100322312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121100322312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21023703705600).

20121100322312 is an abundant number, since it is smaller than the sum of its proper divisors (21926307088888).

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

20121100322312 is a wasteful number, since it uses less digits than its factorization.

20121100322312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728626 (or 1728622 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20121100322312 its reverse (21322300112102), we get a palindrome (41443400434414).

The spelling of 20121100322312 in words is "twenty trillion, one hundred twenty-one billion, one hundred million, three hundred twenty-two thousand, three hundred twelve".