12221813755442 has 4 divisors (see below), whose sum is σ = 18332720633166. Its totient is φ = 6110906877720.

The previous prime is 12221813755399. The next prime is 12221813755517. The reversal of 12221813755442 is 24455731812221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10914361008721 + 1307452746721 = 3303689^2 + 1143439^2 .

It is a super-2 number, since 2×12221813755442² (a number of 27 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 3055453438859 + ... + 3055453438862.

Almost surely, 2^{12221813755442} is an apocalyptic number.

12221813755442 is a deficient number, since it is larger than the sum of its proper divisors (6110906877724).

12221813755442 is an equidigital number, since it uses as much as digits as its factorization.

12221813755442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6110906877723.

The product of its digits is 1075200, while the sum is 47.

The spelling of 12221813755442 in words is "twelve trillion, two hundred twenty-one billion, eight hundred thirteen million, seven hundred fifty-five thousand, four hundred forty-two".