1221102101111 has 2 divisors, whose sum is σ = 1221102101112. Its totient is φ = 1221102101110.

The previous prime is 1221102101041. The next prime is 1221102101117. The reversal of 1221102101111 is 1111012011221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221102101111 - 2²² = 1221097906807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221102101117) 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, 610551050555 + 610551050556.

It is an arithmetic number, because the mean of its divisors is an integer number (610551050556).

Almost surely, 2^{1221102101111} is an apocalyptic number.

1221102101111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102101111 is an equidigital number, since it uses as much as digits as its factorization.

1221102101111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1221102101111 its reverse (1111012011221), we get a palindrome (2332114112332).

The spelling of 1221102101111 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred one thousand, one hundred eleven".