1221211000111 has 6 divisors (see below), whose sum is σ = 1297272585200. Its totient is φ = 1149375058656.

The previous prime is 1221211000019. The next prime is 1221211000187. The reversal of 1221211000111 is 1110001121221.

It is a happy number.

It is not a de Polignac number, because 1221211000111 - 2³³ = 1212621065519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221211000091 and 1221211000100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211001111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2112821511 + ... + 2112822088.

Almost surely, 2^{1221211000111} is an apocalyptic number.

1221211000111 is a deficient number, since it is larger than the sum of its proper divisors (76061585089).

1221211000111 is an equidigital number, since it uses as much as digits as its factorization.

1221211000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4225643633 (or 4225643616 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221211000111 its reverse (1110001121221), we get a palindrome (2331212121332).

The spelling of 1221211000111 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven", and thus it is an aban number.