1221233131242 has 48 divisors (see below), whose sum is σ = 2708692889760. Its totient is φ = 397441499616.

The previous prime is 1221233131213. The next prime is 1221233131273. The reversal of 1221233131242 is 2421313321221.

1221233131242 is a `hidden beast` number, since 1 + 2 + 2 + 12 + 331 + 312 + 4 + 2 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1489609 + ... + 2159027.

It is an arithmetic number, because the mean of its divisors is an integer number (56431101870).

Almost surely, 2^{1221233131242} is an apocalyptic number.

1221233131242 is an abundant number, since it is smaller than the sum of its proper divisors (1487459758518).

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

1221233131242 is a wasteful number, since it uses less digits than its factorization.

1221233131242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671827 (or 671824 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 1221233131242 its reverse (2421313321221), we get a palindrome (3642546452463).

The spelling of 1221233131242 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-three million, one hundred thirty-one thousand, two hundred forty-two".