1123212213221 has 24 divisors (see below), whose sum is σ = 1309603500000. Its totient is φ = 960536846304.

The previous prime is 1123212213199. The next prime is 1123212213239. The reversal of 1123212213221 is 1223122123211.

It is not a de Polignac number, because 1123212213221 - 2¹⁸ = 1123211951077 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 (1123212213521) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 141298355 + ... + 141306303.

It is an arithmetic number, because the mean of its divisors is an integer number (54566812500).

Almost surely, 2^{1123212213221} is an apocalyptic number.

It is an amenable number.

1123212213221 is a deficient number, since it is larger than the sum of its proper divisors (186391286779).

1123212213221 is an equidigital number, since it uses as much as digits as its factorization.

1123212213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241 (or 14234 counting only the distinct ones).

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

Adding to 1123212213221 its reverse (1223122123211), we get a palindrome (2346334336432).

The spelling of 1123212213221 in words is "one trillion, one hundred twenty-three billion, two hundred twelve million, two hundred thirteen thousand, two hundred twenty-one".