1211200121112 has 32 divisors (see below), whose sum is σ = 3046132051200. Its totient is φ = 401315807264.

The previous prime is 1211200121071. The next prime is 1211200121123. The reversal of 1211200121112 is 2111210021121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211200121091 and 1211200121100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151093812 + ... + 151101827.

It is an arithmetic number, because the mean of its divisors is an integer number (95191626600).

Almost surely, 2^{1211200121112} is an apocalyptic number.

1211200121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211200121112 is an abundant number, since it is smaller than the sum of its proper divisors (1834931930088).

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

1211200121112 is a wasteful number, since it uses less digits than its factorization.

1211200121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302195815 (or 302195811 counting only the distinct ones).

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

Adding to 1211200121112 its reverse (2111210021121), we get a palindrome (3322410142233).

Subtracting 1211200121112 from its reverse (2111210021121), we obtain a palindrome (900009900009).

The spelling of 1211200121112 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred twenty-one thousand, one hundred twelve".