20202112121021 has 2 divisors, whose sum is σ = 20202112121022. Its totient is φ = 20202112121020.

The previous prime is 20202112120843. The next prime is 20202112121033. The reversal of 20202112121021 is 12012121120202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18725862820921 + 1476249300100 = 4327339^2 + 1215010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202112121021 - 2¹⁴ = 20202112104637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202112121621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101056060510 + 10101056060511.

It is an arithmetic number, because the mean of its divisors is an integer number (10101056060511).

Almost surely, 2^{20202112121021} is an apocalyptic number.

It is an amenable number.

20202112121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202112121021 is an equidigital number, since it uses as much as digits as its factorization.

20202112121021 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 20202112121021 its reverse (12012121120202), we get a palindrome (32214233241223).

The spelling of 20202112121021 in words is "twenty trillion, two hundred two billion, one hundred twelve million, one hundred twenty-one thousand, twenty-one".