11111212202021 has 2 divisors, whose sum is σ = 11111212202022. Its totient is φ = 11111212202020.

The previous prime is 11111212201951. The next prime is 11111212202059. The reversal of 11111212202021 is 12020221211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10049920765921 + 1061291436100 = 3170161^2 + 1030190^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111212202021 - 2¹⁰ = 11111212200997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111212202071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555606101010 + 5555606101011.

It is an arithmetic number, because the mean of its divisors is an integer number (5555606101011).

Almost surely, 2^{11111212202021} is an apocalyptic number.

It is an amenable number.

11111212202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111212202021 is an equidigital number, since it uses as much as digits as its factorization.

11111212202021 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 11111212202021 its reverse (12020221211111), we get a palindrome (23131433413132).

The spelling of 11111212202021 in words is "eleven trillion, one hundred eleven billion, two hundred twelve million, two hundred two thousand, twenty-one".