11111022121 has 2 divisors, whose sum is σ = 11111022122. Its totient is φ = 11111022120.

The previous prime is 11111022113. The next prime is 11111022127. The reversal of 11111022121 is 12122011111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5607014400 + 5504007721 = 74880^2 + 74189^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111022121 - 2³ = 11111022113 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111022127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555511060 + 5555511061.

It is an arithmetic number, because the mean of its divisors is an integer number (5555511061).

Almost surely, 2^11111022121 is an apocalyptic number.

It is an amenable number.

11111022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111022121 is an equidigital number, since it uses as much as digits as its factorization.

11111022121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11111022121 its reverse (12122011111), we get a palindrome (23233033232).

The spelling of 11111022121 in words is "eleven billion, one hundred eleven million, twenty-two thousand, one hundred twenty-one".