2021121002221 has 2 divisors, whose sum is σ = 2021121002222. Its totient is φ = 2021121002220.

The previous prime is 2021121002081. The next prime is 2021121002233. The reversal of 2021121002221 is 1222001211202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1428969206025 + 592151796196 = 1195395^2 + 769514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121002221 - 2¹⁵ = 2021120969453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021121002195 and 2021121002204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021121002921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560501110 + 1010560501111.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560501111).

Almost surely, 2^{2021121002221} is an apocalyptic number.

It is an amenable number.

2021121002221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121002221 is an equidigital number, since it uses as much as digits as its factorization.

2021121002221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021121002221 its reverse (1222001211202), we get a palindrome (3243122213423).

The spelling of 2021121002221 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two thousand, two hundred twenty-one".