1111210222081 has 2 divisors, whose sum is σ = 1111210222082. Its totient is φ = 1111210222080.

The previous prime is 1111210222079. The next prime is 1111210222117. The reversal of 1111210222081 is 1802220121111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600284048400 + 510926173681 = 774780^2 + 714791^2 .

It is an emirp because it is prime and its reverse (1802220121111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111210222081 - 2¹ = 1111210222079 is a prime.

It is a super-2 number, since 2×1111210222081² (a number of 25 digits) contains 22 as substring.

Together with 1111210222079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1111210222181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555605111040 + 555605111041.

It is an arithmetic number, because the mean of its divisors is an integer number (555605111041).

Almost surely, 2^{1111210222081} is an apocalyptic number.

It is an amenable number.

1111210222081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111210222081 is an equidigital number, since it uses as much as digits as its factorization.

1111210222081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 1111210222081 its reverse (1802220121111), we get a palindrome (2913430343192).

The spelling of 1111210222081 in words is "one trillion, one hundred eleven billion, two hundred ten million, two hundred twenty-two thousand, eighty-one".