2021121021121 has 4 divisors (see below), whose sum is σ = 2033520536752. Its totient is φ = 2008721505492.

The previous prime is 2021121021043. The next prime is 2021121021181. The reversal of 2021121021121 is 1211201211202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021121021121 - 2³⁷ = 1883682067649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021121021095 and 2021121021104.

It is not an unprimeable number, because it can be changed into a prime (2021121021181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6199757571 + ... + 6199757896.

It is an arithmetic number, because the mean of its divisors is an integer number (508380134188).

Almost surely, 2^{2021121021121} is an apocalyptic number.

It is an amenable number.

2021121021121 is a deficient number, since it is larger than the sum of its proper divisors (12399515631).

2021121021121 is a wasteful number, since it uses less digits than its factorization.

2021121021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12399515630.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2021121021121 its reverse (1211201211202), we get a palindrome (3232322232323).

The spelling of 2021121021121 in words is "two trillion, twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-one".