1211302122120 has 128 divisors (see below), whose sum is σ = 4042489248000. Its totient is φ = 322628659200.

The previous prime is 1211302122101. The next prime is 1211302122139. The reversal of 1211302122120 is 212212031121.

1211302122120 is a `hidden beast` number, since 1 + 211 + 30 + 212 + 212 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1211302122101) and next prime (1211302122139).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1211302122093 and 1211302122102.

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 31 ways as a sum of consecutive naturals, for example, 237720 + ... + 1574520.

It is an arithmetic number, because the mean of its divisors is an integer number (31581947250).

Almost surely, 2^{1211302122120} is an apocalyptic number.

1211302122120 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 1211302122120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2021244624000).

1211302122120 is an abundant number, since it is smaller than the sum of its proper divisors (2831187125880).

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

1211302122120 is a wasteful number, since it uses less digits than its factorization.

1211302122120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337660 (or 1337650 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1211302122120 its reverse (212212031121), we get a palindrome (1423514153241).

Subtracting from 1211302122120 its reverse (212212031121), we obtain a palindrome (999090090999).

The spelling of 1211302122120 in words is "one trillion, two hundred eleven billion, three hundred two million, one hundred twenty-two thousand, one hundred twenty".