211121110022021 has 2 divisors, whose sum is σ = 211121110022022. Its totient is φ = 211121110022020.

The previous prime is 211121110021999. The next prime is 211121110022041. The reversal of 211121110022021 is 120220011121112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209560771773796 + 1560338248225 = 14476214^2 + 1249135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211121110022021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121110022041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560555011010 + 105560555011011.

It is an arithmetic number, because the mean of its divisors is an integer number (105560555011011).

Almost surely, 2^{211121110022021} is an apocalyptic number.

It is an amenable number.

211121110022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121110022021 is an equidigital number, since it uses as much as digits as its factorization.

211121110022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211121110022021 its reverse (120220011121112), we get a palindrome (331341121143133).

The spelling of 211121110022021 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred ten million, twenty-two thousand, twenty-one".