1221110002111 has 4 divisors (see below), whose sum is σ = 1221190137424. Its totient is φ = 1221029866800.

The previous prime is 1221110002067. The next prime is 1221110002121. The reversal of 1221110002111 is 1112000111221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221110002111 - 2⁹ = 1221110001599 is a prime.

It is a super-2 number, since 2×1221110002111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221110002091 and 1221110002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110002121) 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, 40044795 + ... + 40075276.

It is an arithmetic number, because the mean of its divisors is an integer number (305297534356).

Almost surely, 2^{1221110002111} is an apocalyptic number.

1221110002111 is a deficient number, since it is larger than the sum of its proper divisors (80135313).

1221110002111 is an equidigital number, since it uses as much as digits as its factorization.

1221110002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80135312.

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

Adding to 1221110002111 its reverse (1112000111221), we get a palindrome (2333110113332).

The spelling of 1221110002111 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two thousand, one hundred eleven".