2021102211221 has 2 divisors, whose sum is σ = 2021102211222. Its totient is φ = 2021102211220.

The previous prime is 2021102211181. The next prime is 2021102211257. The reversal of 2021102211221 is 1221122011202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1969124595025 + 51977616196 = 1403255^2 + 227986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021102211221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021102211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021102211521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010551105610 + 1010551105611.

It is an arithmetic number, because the mean of its divisors is an integer number (1010551105611).

Almost surely, 2^{2021102211221} is an apocalyptic number.

It is an amenable number.

2021102211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021102211221 is an equidigital number, since it uses as much as digits as its factorization.

2021102211221 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 2021102211221 its reverse (1221122011202), we get a palindrome (3242224222423).

The spelling of 2021102211221 in words is "two trillion, twenty-one billion, one hundred two million, two hundred eleven thousand, two hundred twenty-one".