1212100112120 has 32 divisors (see below), whose sum is σ = 2728172793600. Its totient is φ = 484671593088.

The previous prime is 1212100112029. The next prime is 1212100112131. The reversal of 1212100112120 is 212110012121.

It is a junction number, because it is equal to n+sod(n) for n = 1212100112095 and 1212100112104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5147519 + ... + 5377838.

It is an arithmetic number, because the mean of its divisors is an integer number (85255399800).

Almost surely, 2^{1212100112120} is an apocalyptic number.

1212100112120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212100112120 is an abundant number, since it is smaller than the sum of its proper divisors (1516072681480).

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

1212100112120 is a wasteful number, since it uses less digits than its factorization.

1212100112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10528247 (or 10528243 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212100112120 its reverse (212110012121), we get a palindrome (1424210124241).

Subtracting from 1212100112120 its reverse (212110012121), we obtain a palindrome (999990099999).

It can be divided in two parts, 12121001 and 12120, that added together give a palindrome (12133121).

The spelling of 1212100112120 in words is "one trillion, two hundred twelve billion, one hundred million, one hundred twelve thousand, one hundred twenty".