1221021122111 has 8 divisors (see below), whose sum is σ = 1395491057664. Its totient is φ = 1046560773240.

The previous prime is 1221021122047. The next prime is 1221021122137. The reversal of 1221021122111 is 1112211201221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221021122111 - 2⁶ = 1221021122047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221021122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021122161) 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 in 7 ways as a sum of consecutive naturals, for example, 2121635 + ... + 2635028.

It is an arithmetic number, because the mean of its divisors is an integer number (174436382208).

Almost surely, 2^{1221021122111} is an apocalyptic number.

1221021122111 is a deficient number, since it is larger than the sum of its proper divisors (174469935553).

1221021122111 is an equidigital number, since it uses as much as digits as its factorization.

1221021122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4793341.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221021122111 its reverse (1112211201221), we get a palindrome (2333232323332).

The spelling of 1221021122111 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred eleven".