1211111010200 has 96 divisors (see below), whose sum is σ = 3465640788960. Its totient is φ = 383296665600.

The previous prime is 1211111010169. The next prime is 1211111010203. The reversal of 1211111010200 is 20101111121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111010203) 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, 33254081 + ... + 33290480.

It is an arithmetic number, because the mean of its divisors is an integer number (36100424885).

Almost surely, 2^{1211111010200} is an apocalyptic number.

1211111010200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111010200 is an abundant number, since it is smaller than the sum of its proper divisors (2254529778760).

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

1211111010200 is a wasteful number, since it uses less digits than its factorization.

1211111010200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66544597 (or 66544588 counting only the distinct ones).

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

Adding to 1211111010200 its reverse (20101111121), we get a palindrome (1231212121321).

It can be divided in two parts, 121111 and 1010200, that added together give a palindrome (1131311).

The spelling of 1211111010200 in words is "one trillion, two hundred eleven billion, one hundred eleven million, ten thousand, two hundred".