1211210021112 has 1024 divisors, whose sum is σ = 4200815001600. Its totient is φ = 282175488000.

The previous prime is 1211210021059. The next prime is 1211210021137. The reversal of 1211210021112 is 2111200121121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211210021091 and 1211210021100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 4469409537 + ... + 4469409807.

It is an arithmetic number, because the mean of its divisors is an integer number (4102358400).

Almost surely, 2^{1211210021112} is an apocalyptic number.

1211210021112 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 1211210021112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100407500800).

1211210021112 is an abundant number, since it is smaller than the sum of its proper divisors (2989604980488).

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

1211210021112 is a wasteful number, since it uses less digits than its factorization.

1211210021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 464 counting only the distinct ones).

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

Adding to 1211210021112 its reverse (2111200121121), we get a palindrome (3322410142233).

The spelling of 1211210021112 in words is "one trillion, two hundred eleven billion, two hundred ten million, twenty-one thousand, one hundred twelve".