1211222121120 has 240 divisors, whose sum is σ = 4663205715168. Its totient is φ = 293629570560.

The previous prime is 1211222121113. The next prime is 1211222121227. The reversal of 1211222121120 is 211212221121.

1211222121120 is a `hidden beast` number, since 1 + 211 + 2 + 221 + 211 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 = 1211222121093 and 1211222121102.

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 39 ways as a sum of consecutive naturals, for example, 4105554 + ... + 4390673.

Almost surely, 2^{1211222121120} is an apocalyptic number.

1211222121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211222121120 is an abundant number, since it is smaller than the sum of its proper divisors (3451983594048).

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

1211222121120 is a wasteful number, since it uses less digits than its factorization.

1211222121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496265 (or 8496248 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211222121120 its reverse (211212221121), we get a palindrome (1422434342241).

The spelling of 1211222121120 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty".