11211022121021 has 2 divisors, whose sum is σ = 11211022121022. Its totient is φ = 11211022121020.

The previous prime is 11211022121003. The next prime is 11211022121053. The reversal of 11211022121021 is 12012122011211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8596559496121 + 2614462624900 = 2931989^2 + 1616930^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211022121021 - 2⁴² = 6812975609917 is a prime.

It is a super-4 number, since 4×11211022121021⁴ (a number of 53 digits) contains 4444 as substring.

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 (11211022124021) 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, 5605511060510 + 5605511060511.

It is an arithmetic number, because the mean of its divisors is an integer number (5605511060511).

Almost surely, 2^{11211022121021} is an apocalyptic number.

It is an amenable number.

11211022121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211022121021 is an equidigital number, since it uses as much as digits as its factorization.

11211022121021 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 11211022121021 its reverse (12012122011211), we get a palindrome (23223144132232).

The spelling of 11211022121021 in words is "eleven trillion, two hundred eleven billion, twenty-two million, one hundred twenty-one thousand, twenty-one".