2112221021021 has 2 divisors, whose sum is σ = 2112221021022. Its totient is φ = 2112221021020.

The previous prime is 2112221021011. The next prime is 2112221021047. The reversal of 2112221021021 is 1201201222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1936564476025 + 175656544996 = 1391605^2 + 419114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112221021021 - 2²² = 2112216826717 is a prime.

It is a super-2 number, since 2×2112221021021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112221021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056110510510 + 1056110510511.

It is an arithmetic number, because the mean of its divisors is an integer number (1056110510511).

Almost surely, 2^{2112221021021} is an apocalyptic number.

It is an amenable number.

2112221021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112221021021 is an equidigital number, since it uses as much as digits as its factorization.

2112221021021 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 17.

Adding to 2112221021021 its reverse (1201201222112), we get a palindrome (3313422243133).

The spelling of 2112221021021 in words is "two trillion, one hundred twelve billion, two hundred twenty-one million, twenty-one thousand, twenty-one".