21022112012021 has 2 divisors, whose sum is σ = 21022112012022. Its totient is φ = 21022112012020.

The previous prime is 21022112012009. The next prime is 21022112012113. The reversal of 21022112012021 is 12021021122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19956644205796 + 1065467806225 = 4467286^2 + 1032215^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022112012021 - 2¹⁴ = 21022111995637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022112042021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511056006010 + 10511056006011.

It is an arithmetic number, because the mean of its divisors is an integer number (10511056006011).

Almost surely, 2^{21022112012021} is an apocalyptic number.

It is an amenable number.

21022112012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022112012021 is an equidigital number, since it uses as much as digits as its factorization.

21022112012021 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 21022112012021 its reverse (12021021122012), we get a palindrome (33043133134033).

The spelling of 21022112012021 in words is "twenty-one trillion, twenty-two billion, one hundred twelve million, twelve thousand, twenty-one".