2211221021021 has 2 divisors, whose sum is σ = 2211221021022. Its totient is φ = 2211221021020.

The previous prime is 2211221021011. The next prime is 2211221021047. The reversal of 2211221021021 is 1201201221122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1862665392025 + 348555628996 = 1364795^2 + 590386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211221021021 - 2³⁸ = 1936343114077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211221021011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105610510510 + 1105610510511.

It is an arithmetic number, because the mean of its divisors is an integer number (1105610510511).

Almost surely, 2^{2211221021021} is an apocalyptic number.

It is an amenable number.

2211221021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211221021021 is an equidigital number, since it uses as much as digits as its factorization.

2211221021021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2211221021021 its reverse (1201201221122), we get a palindrome (3412422242143).

The spelling of 2211221021021 in words is "two trillion, two hundred eleven billion, two hundred twenty-one million, twenty-one thousand, twenty-one".