2221010221021 has 2 divisors, whose sum is σ = 2221010221022. Its totient is φ = 2221010221020.

The previous prime is 2221010221019. The next prime is 2221010221033. The reversal of 2221010221021 is 1201220101222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1259806452921 + 961203768100 = 1122411^2 + 980410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221010221021 - 2¹ = 2221010221019 is a prime.

Together with 2221010221019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2221010220986 and 2221010221004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221010221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110505110510 + 1110505110511.

It is an arithmetic number, because the mean of its divisors is an integer number (1110505110511).

Almost surely, 2^{2221010221021} is an apocalyptic number.

It is an amenable number.

2221010221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221010221021 is an equidigital number, since it uses as much as digits as its factorization.

2221010221021 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 16.

Adding to 2221010221021 its reverse (1201220101222), we get a palindrome (3422230322243).

The spelling of 2221010221021 in words is "two trillion, two hundred twenty-one billion, ten million, two hundred twenty-one thousand, twenty-one".