1221102001111 has 2 divisors, whose sum is σ = 1221102001112. Its totient is φ = 1221102001110.

The previous prime is 1221102001081. The next prime is 1221102001139. The reversal of 1221102001111 is 1111002011221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221102001111 - 2¹³ = 1221101992919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221102001091 and 1221102001100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221102101111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551000555 + 610551000556.

It is an arithmetic number, because the mean of its divisors is an integer number (610551000556).

Almost surely, 2^{1221102001111} is an apocalyptic number.

1221102001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102001111 is an equidigital number, since it uses as much as digits as its factorization.

1221102001111 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 13.

Adding to 1221102001111 its reverse (1111002011221), we get a palindrome (2332104012332).

The spelling of 1221102001111 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one thousand, one hundred eleven".