12211551221442 has 16 divisors (see below), whose sum is σ = 24584844844992. Its totient is φ = 4043560006800.

The previous prime is 12211551221431. The next prime is 12211551221461. The reversal of 12211551221442 is 24412215511221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6739265773 + ... + 6739267584.

It is an arithmetic number, because the mean of its divisors is an integer number (1536552802812).

Almost surely, 2^{12211551221442} is an apocalyptic number.

12211551221442 is an abundant number, since it is smaller than the sum of its proper divisors (12373293623550).

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

12211551221442 is a wasteful number, since it uses less digits than its factorization.

12211551221442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13478533513.

The product of its digits is 12800, while the sum is 33.

Adding to 12211551221442 its reverse (24412215511221), we get a palindrome (36623766732663).

The spelling of 12211551221442 in words is "twelve trillion, two hundred eleven billion, five hundred fifty-one million, two hundred twenty-one thousand, four hundred forty-two".