1211111040204 has 480 divisors, whose sum is σ = 3641156682240. Its totient is φ = 347280950016.

The previous prime is 1211111040197. The next prime is 1211111040211. The reversal of 1211111040204 is 4020401111121.

It is an interprime number because it is at equal distance from previous prime (1211111040197) and next prime (1211111040211).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3050657334 + ... + 3050657730.

It is an arithmetic number, because the mean of its divisors is an integer number (7585743088).

Almost surely, 2^{1211111040204} 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 1211111040204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1820578341120).

1211111040204 is an abundant number, since it is smaller than the sum of its proper divisors (2430045642036).

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

1211111040204 is a wasteful number, since it uses less digits than its factorization.

1211111040204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211111040204 its reverse (4020401111121), we get a palindrome (5231512151325).

The spelling of 1211111040204 in words is "one trillion, two hundred eleven billion, one hundred eleven million, forty thousand, two hundred four".