2021001211121 has 2 divisors, whose sum is σ = 2021001211122. Its totient is φ = 2021001211120.

The previous prime is 2021001211039. The next prime is 2021001211123. The reversal of 2021001211121 is 1211121001202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2003640250000 + 17360961121 = 1415500^2 + 131761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021001211121 - 2¹⁰ = 2021001210097 is a prime.

Together with 2021001211123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021001211096 and 2021001211105.

It is not a weakly prime, because it can be changed into another prime (2021001211123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500605560 + 1010500605561.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500605561).

Almost surely, 2^{2021001211121} is an apocalyptic number.

It is an amenable number.

2021001211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021001211121 is an equidigital number, since it uses as much as digits as its factorization.

2021001211121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2021001211121 its reverse (1211121001202), we get a palindrome (3232122212323).

The spelling of 2021001211121 in words is "two trillion, twenty-one billion, one million, two hundred eleven thousand, one hundred twenty-one".