1211221331442 has 48 divisors (see below), whose sum is σ = 2638376691288. Its totient is φ = 401577523200.

The previous prime is 1211221331417. The next prime is 1211221331449. The reversal of 1211221331442 is 2441331221121.

1211221331442 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 2 + 213 + 3 + 1 + 442 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 771465345561 + 439755985881 = 878331^2 + 663141^2 .

It is a super-2 number, since 2×1211221331442² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211221331449) 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, 21862008 + ... + 21917340.

Almost surely, 2^{1211221331442} is an apocalyptic number.

1211221331442 is an abundant number, since it is smaller than the sum of its proper divisors (1427155359846).

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

1211221331442 is a wasteful number, since it uses less digits than its factorization.

1211221331442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61835 (or 61832 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 1211221331442 its reverse (2441331221121), we get a palindrome (3652552552563).

The spelling of 1211221331442 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, three hundred thirty-one thousand, four hundred forty-two".