20121100312 has 32 divisors (see below), whose sum is σ = 41234901120. Its totient is φ = 9163307520.

The previous prime is 20121100297. The next prime is 20121100319. The reversal of 20121100312 is 21300112102.

It is a junction number, because it is equal to n+sod(n) for n = 20121100292 and 20121100301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121100319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2382063 + ... + 2390494.

It is an arithmetic number, because the mean of its divisors is an integer number (1288590660).

Almost surely, 2^20121100312 is an apocalyptic number.

It is an amenable number.

20121100312 is an abundant number, since it is smaller than the sum of its proper divisors (21113800808).

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

20121100312 is a wasteful number, since it uses less digits than its factorization.

20121100312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4772611 (or 4772607 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20121100312 its reverse (21300112102), we get a palindrome (41421212414).

The spelling of 20121100312 in words is "twenty billion, one hundred twenty-one million, one hundred thousand, three hundred twelve".