1211201012112 has 160 divisors (see below), whose sum is σ = 3853805840640. Its totient is φ = 319204730880.

The previous prime is 1211201012083. The next prime is 1211201012113. The reversal of 1211201012112 is 2112101021121.

It is a happy number.

It is a super-2 number, since 2×1211201012112² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211201012091 and 1211201012100.

It is not an unprimeable number, because it can be changed into a prime (1211201012113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5931814 + ... + 6132602.

It is an arithmetic number, because the mean of its divisors is an integer number (24086286504).

Almost surely, 2^{1211201012112} is an apocalyptic number.

1211201012112 is a gapful number since it is divisible by the number (12) 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 1211201012112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1926902920320).

1211201012112 is an abundant number, since it is smaller than the sum of its proper divisors (2642604828528).

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

1211201012112 is a wasteful number, since it uses less digits than its factorization.

1211201012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202201 (or 202195 counting only the distinct ones).

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

Adding to 1211201012112 its reverse (2112101021121), we get a palindrome (3323302033233).

Subtracting 1211201012112 from its reverse (2112101021121), we obtain a palindrome (900900009009).

The spelling of 1211201012112 in words is "one trillion, two hundred eleven billion, two hundred one million, twelve thousand, one hundred twelve".