1221102002111 has 4 divisors (see below), whose sum is σ = 1221298421712. Its totient is φ = 1220905582512.

The previous prime is 1221102002093. The next prime is 1221102002117. The reversal of 1221102002111 is 1112002011221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221102002111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102002117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98200475 + ... + 98212908.

It is an arithmetic number, because the mean of its divisors is an integer number (305324605428).

Almost surely, 2^{1221102002111} is an apocalyptic number.

1221102002111 is a deficient number, since it is larger than the sum of its proper divisors (196419601).

1221102002111 is an equidigital number, since it uses as much as digits as its factorization.

1221102002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196419600.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221102002111 its reverse (1112002011221), we get a palindrome (2333104013332).

The spelling of 1221102002111 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two thousand, one hundred eleven".