1011221222111 has 2 divisors, whose sum is σ = 1011221222112. Its totient is φ = 1011221222110.

The previous prime is 1011221222057. The next prime is 1011221222131. The reversal of 1011221222111 is 1112221221101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011221222111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011221222111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011221222131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610611055 + 505610611056.

It is an arithmetic number, because the mean of its divisors is an integer number (505610611056).

Almost surely, 2^{1011221222111} is an apocalyptic number.

1011221222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011221222111 is an equidigital number, since it uses as much as digits as its factorization.

1011221222111 is an evil number, because the sum of its binary digits is even.

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

Adding to 1011221222111 its reverse (1112221221101), we get a palindrome (2123442443212).

The spelling of 1011221222111 in words is "one trillion, eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".