1221212243223 has 24 divisors (see below), whose sum is σ = 2050138396800. Its totient is φ = 686007843984.

The previous prime is 1221212243213. The next prime is 1221212243249. The reversal of 1221212243223 is 3223422121221.

1221212243223 is a `hidden beast` number, since 1 + 2 + 212 + 1 + 224 + 3 + 223 = 666.

It is not a de Polignac number, because 1221212243223 - 2²⁵ = 1221178688791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212243213) 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, 164270193 + ... + 164277626.

It is an arithmetic number, because the mean of its divisors is an integer number (85422433200).

Almost surely, 2^{1221212243223} is an apocalyptic number.

1221212243223 is a deficient number, since it is larger than the sum of its proper divisors (828926153577).

1221212243223 is a wasteful number, since it uses less digits than its factorization.

1221212243223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328547891 (or 328547888 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 1221212243223 its reverse (3223422121221), we get a palindrome (4444634364444).

The spelling of 1221212243223 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred forty-three thousand, two hundred twenty-three".