1221002122111 has 2 divisors, whose sum is σ = 1221002122112. Its totient is φ = 1221002122110.

The previous prime is 1221002122031. The next prime is 1221002122121. The reversal of 1221002122111 is 1112212001221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002122111 - 2¹⁵ = 1221002089343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002122121) 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, 610501061055 + 610501061056.

It is an arithmetic number, because the mean of its divisors is an integer number (610501061056).

Almost surely, 2^{1221002122111} is an apocalyptic number.

1221002122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002122111 is an equidigital number, since it uses as much as digits as its factorization.

1221002122111 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 16.

Adding to 1221002122111 its reverse (1112212001221), we get a palindrome (2333214123332).

The spelling of 1221002122111 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty-two thousand, one hundred eleven".