1211202100120 has 64 divisors (see below), whose sum is σ = 2888211880800. Its totient is φ = 455555143680.

The previous prime is 1211202100091. The next prime is 1211202100193. The reversal of 1211202100120 is 210012021121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211202100120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106186 + ... + 1560025.

Almost surely, 2^{1211202100120} is an apocalyptic number.

1211202100120 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 1211202100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444105940400).

1211202100120 is an abundant number, since it is smaller than the sum of its proper divisors (1677009780680).

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

1211202100120 is a wasteful number, since it uses less digits than its factorization.

1211202100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667308 (or 1667304 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211202100120 its reverse (210012021121), we get a palindrome (1421214121241).

The spelling of 1211202100120 in words is "one trillion, two hundred eleven billion, two hundred two million, one hundred thousand, one hundred twenty".