2021121121001 has 2 divisors, whose sum is σ = 2021121121002. Its totient is φ = 2021121121000.

The previous prime is 2021121120989. The next prime is 2021121121003. The reversal of 2021121121001 is 1001211211202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1773491475625 + 247629645376 = 1331725^2 + 497624^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121121001 - 2³⁸ = 1746243214057 is a prime.

Together with 2021121121003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2021121121003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560560500 + 1010560560501.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560560501).

Almost surely, 2^{2021121121001} is an apocalyptic number.

It is an amenable number.

2021121121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121121001 is an equidigital number, since it uses as much as digits as its factorization.

2021121121001 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 2021121121001 its reverse (1001211211202), we get a palindrome (3022332332203).

The spelling of 2021121121001 in words is "two trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one".