1211320022112 has 144 divisors (see below), whose sum is σ = 3541442591232. Its totient is φ = 392455065600.

The previous prime is 1211320022111. The next prime is 1211320022131. The reversal of 1211320022112 is 2112200231121.

1211320022112 is a `hidden beast` number, since 1 + 211 + 320 + 0 + 22 + 112 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211320022111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10352737 + ... + 10469087.

It is an arithmetic number, because the mean of its divisors is an integer number (24593351328).

Almost surely, 2^{1211320022112} is an apocalyptic number.

1211320022112 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 1211320022112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1770721295616).

1211320022112 is an abundant number, since it is smaller than the sum of its proper divisors (2330122569120).

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

1211320022112 is a wasteful number, since it uses less digits than its factorization.

1211320022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117381 (or 117370 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1211320022112 its reverse (2112200231121), we get a palindrome (3323520253233).

The spelling of 1211320022112 in words is "one trillion, two hundred eleven billion, three hundred twenty million, twenty-two thousand, one hundred twelve".