1211101000000 has 196 divisors, whose sum is σ = 3012074023084. Its totient is φ = 483148800000.

The previous prime is 1211100999971. The next prime is 1211101000009. The reversal of 1211101000000 is 1011121.

It can be written as a sum of positive squares in 14 ways, for example, as 909093599296 + 302007400704 = 953464^2 + 549552^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101000009) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 432998602 + ... + 433001398.

Almost surely, 2^{1211101000000} is an apocalyptic number.

1211101000000 is a gapful number since it is divisible by the number (10) 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 1211101000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1506037011542).

1211101000000 is an abundant number, since it is smaller than the sum of its proper divisors (1800973023084).

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

1211101000000 is an frugal number, since it uses more digits than its factorization.

1211101000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272 (or 3237 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 1211101000000 its reverse (1011121), we get a palindrome (1211102011121).

The spelling of 1211101000000 in words is "one trillion, two hundred eleven billion, one hundred one million", and thus it is an aban number.