1210121111120 has 40 divisors (see below), whose sum is σ = 2813816455560. Its totient is φ = 483999434240.

The previous prime is 1210121111099. The next prime is 1210121111131. The reversal of 1210121111120 is 211111210121.

It can be written as a sum of positive squares in 4 ways, for example, as 105284674576 + 1104836436544 = 324476^2 + 1051112^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1210121111095 and 1210121111104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34466 + ... + 1556094.

It is an arithmetic number, because the mean of its divisors is an integer number (70345411389).

Almost surely, 2^{1210121111120} is an apocalyptic number.

1210121111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210121111120 is an abundant number, since it is smaller than the sum of its proper divisors (1603695344440).

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

1210121111120 is a wasteful number, since it uses less digits than its factorization.

1210121111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531583 (or 1531577 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1210121111120 its reverse (211111210121), we get a palindrome (1421232321241).

Subtracting from 1210121111120 its reverse (211111210121), we obtain a palindrome (999009900999).

The spelling of 1210121111120 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty".