1213100203112 has 128 divisors (see below), whose sum is σ = 2736564929280. Its totient is φ = 493205760000.

The previous prime is 1213100203111. The next prime is 1213100203141. The reversal of 1213100203112 is 2113020013121.

It is a super-2 number, since 2×1213100203112² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213100203111) 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 31 ways as a sum of consecutive naturals, for example, 181029362 + ... + 181036062.

It is an arithmetic number, because the mean of its divisors is an integer number (21379413510).

Almost surely, 2^{1213100203112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213100203112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368282464640).

1213100203112 is an abundant number, since it is smaller than the sum of its proper divisors (1523464726168).

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

1213100203112 is a wasteful number, since it uses less digits than its factorization.

1213100203112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8923 (or 8919 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1213100203112 its reverse (2113020013121), we get a palindrome (3326120216233).

The spelling of 1213100203112 in words is "one trillion, two hundred thirteen billion, one hundred million, two hundred three thousand, one hundred twelve".