2221211204021 has 2 divisors, whose sum is σ = 2221211204022. Its totient is φ = 2221211204020.

The previous prime is 2221211203999. The next prime is 2221211204029. The reversal of 2221211204021 is 1204021121222.

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., 1977086275921 + 244124928100 = 1406089^2 + 494090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221211204021 - 2³⁴ = 2204031334837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221211203984 and 2221211204002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221211204029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110605602010 + 1110605602011.

It is an arithmetic number, because the mean of its divisors is an integer number (1110605602011).

Almost surely, 2^{2221211204021} is an apocalyptic number.

It is an amenable number.

2221211204021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221211204021 is an equidigital number, since it uses as much as digits as its factorization.

2221211204021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221211204021 its reverse (1204021121222), we get a palindrome (3425232325243).

The spelling of 2221211204021 in words is "two trillion, two hundred twenty-one billion, two hundred eleven million, two hundred four thousand, twenty-one".