2120021021121 has 16 divisors (see below), whose sum is σ = 2831348520000. Its totient is φ = 1411022018048.

The previous prime is 2120021021081. The next prime is 2120021021171. The reversal of 2120021021121 is 1211201200212.

It is a cyclic number.

It is not a de Polignac number, because 2120021021121 - 2⁷ = 2120021020993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120021021121.

It is not an unprimeable number, because it can be changed into a prime (2120021021171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5200105 + ... + 5592953.

It is an arithmetic number, because the mean of its divisors is an integer number (176959282500).

Almost surely, 2^{2120021021121} is an apocalyptic number.

It is an amenable number.

2120021021121 is a deficient number, since it is larger than the sum of its proper divisors (711327498879).

2120021021121 is a wasteful number, since it uses less digits than its factorization.

2120021021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395808.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2120021021121 its reverse (1211201200212), we get a palindrome (3331222221333).

The spelling of 2120021021121 in words is "two trillion, one hundred twenty billion, twenty-one million, twenty-one thousand, one hundred twenty-one".