12221998786181 has 4 divisors (see below), whose sum is σ = 12222030141600. Its totient is φ = 12221967430764.

The previous prime is 12221998786121. The next prime is 12221998786183. The reversal of 12221998786181 is 18168789912221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12221998786181 - 2⁶ = 12221998786117 is a prime.

It is a super-2 number, since 2×12221998786181² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221998786183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15085571 + ... + 15875088.

It is an arithmetic number, because the mean of its divisors is an integer number (3055507535400).

Almost surely, 2^{12221998786181} is an apocalyptic number.

It is an amenable number.

12221998786181 is a deficient number, since it is larger than the sum of its proper divisors (31355419).

12221998786181 is an equidigital number, since it uses as much as digits as its factorization.

12221998786181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31355418.

The product of its digits is 13934592, while the sum is 65.

The spelling of 12221998786181 in words is "twelve trillion, two hundred twenty-one billion, nine hundred ninety-eight million, seven hundred eighty-six thousand, one hundred eighty-one".