1221132212111 has 32 divisors (see below), whose sum is σ = 1461362466816. Its totient is φ = 998330256000.

The previous prime is 1221132212071. The next prime is 1221132212123. The reversal of 1221132212111 is 1112122311221.

It is not a de Polignac number, because 1221132212111 - 2¹⁸ = 1221131949967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221132212191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55161401 + ... + 55183533.

It is an arithmetic number, because the mean of its divisors is an integer number (45667577088).

Almost surely, 2^{1221132212111} is an apocalyptic number.

1221132212111 is a deficient number, since it is larger than the sum of its proper divisors (240230254705).

1221132212111 is a wasteful number, since it uses less digits than its factorization.

1221132212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25823.

The product of its digits is 96, while the sum is 20.

Adding to 1221132212111 its reverse (1112122311221), we get a palindrome (2333254523332).

The spelling of 1221132212111 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred twelve thousand, one hundred eleven".