1211111031104 has 112 divisors (see below), whose sum is σ = 2599391507328. Its totient is φ = 556554405888.

The previous prime is 1211111031071. The next prime is 1211111031107. The reversal of 1211111031104 is 4011301111121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111031107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312381614 + ... + 312385490.

It is an arithmetic number, because the mean of its divisors is an integer number (23208852744).

Almost surely, 2^{1211111031104} 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 1211111031104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299695753664).

1211111031104 is an abundant number, since it is smaller than the sum of its proper divisors (1388280476224).

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

1211111031104 is a wasteful number, since it uses less digits than its factorization.

1211111031104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5432 (or 5422 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1211111031104 its reverse (4011301111121), we get a palindrome (5222412142225).

The spelling of 1211111031104 in words is "one trillion, two hundred eleven billion, one hundred eleven million, thirty-one thousand, one hundred four".