1211121223232 has 56 divisors (see below), whose sum is σ = 2546072331264. Its totient is φ = 569629878272.

The previous prime is 1211121223219. The next prime is 1211121223241. The reversal of 1211121223232 is 2323221211121.

It is a junction number, because it is equal to n+sod(n) for n = 1211121223198 and 1211121223207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1708193 + ... + 2310879.

It is an arithmetic number, because the mean of its divisors is an integer number (45465577344).

Almost surely, 2^{1211121223232} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211121223232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273036165632).

1211121223232 is an abundant number, since it is smaller than the sum of its proper divisors (1334951108032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211121223232 is a wasteful number, since it uses less digits than its factorization.

1211121223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604563 (or 604553 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

Adding to 1211121223232 its reverse (2323221211121), we get a palindrome (3534342434353).

The spelling of 1211121223232 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-three thousand, two hundred thirty-two".