2121121221120 has 240 divisors, whose sum is σ = 8013862071072. Its totient is φ = 514211143680.

The previous prime is 2121121221103. The next prime is 2121121221151. The reversal of 2121121221120 is 211221211212.

2121121221120 is a `hidden beast` number, since 212 + 11 + 212 + 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 = 2121121221093 and 2121121221102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3931222 + ... + 4438101.

Almost surely, 2^{2121121221120} is an apocalyptic number.

2121121221120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121121221120 is an abundant number, since it is smaller than the sum of its proper divisors (5892740849952).

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

2121121221120 is a wasteful number, since it uses less digits than its factorization.

2121121221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8369363 (or 8369344 counting only the distinct ones).

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

Adding to 2121121221120 its reverse (211221211212), we get a palindrome (2332342432332).

The spelling of 2121121221120 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty".