1211210211100 has 72 divisors (see below), whose sum is σ = 2708009172848. Its totient is φ = 470013580800.

The previous prime is 1211210211097. The next prime is 1211210211149. The reversal of 1211210211100 is 11120121121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 914694 + ... + 1805293.

Almost surely, 2^{1211210211100} is an apocalyptic number.

1211210211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211210211100 is an abundant number, since it is smaller than the sum of its proper divisors (1496798961748).

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

1211210211100 is a wasteful number, since it uses less digits than its factorization.

1211210211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720135 (or 2720128 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211210211100 its reverse (11120121121), we get a palindrome (1222330332221).

The spelling of 1211210211100 in words is "one trillion, two hundred eleven billion, two hundred ten million, two hundred eleven thousand, one hundred".