1211101012100 has 144 divisors (see below), whose sum is σ = 3018317232000. Its totient is φ = 413193830400.

The previous prime is 1211101012087. The next prime is 1211101012169. The reversal of 1211101012100 is 12101011121.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210660026 + ... + 210665774.

Almost surely, 2^{1211101012100} is an apocalyptic number.

1211101012100 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 1211101012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509158616000).

1211101012100 is an abundant number, since it is smaller than the sum of its proper divisors (1807216219900).

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

1211101012100 is a wasteful number, since it uses less digits than its factorization.

1211101012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7198 (or 7191 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1211101012100 its reverse (12101011121), we get a palindrome (1223202023221).

The spelling of 1211101012100 in words is "one trillion, two hundred eleven billion, one hundred one million, twelve thousand, one hundred".