20121222222191 has 4 divisors (see below), whose sum is σ = 20121610812072. Its totient is φ = 20120833632312.

The previous prime is 20121222222187. The next prime is 20121222222251. The reversal of 20121222222191 is 19122222212102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121222222191 - 2² = 20121222222187 is a prime.

It is a super-3 number, since 3×20121222222191³ (a number of 41 digits) contains 333 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 (20121222222181) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 194217260 + ... + 194320833.

It is an arithmetic number, because the mean of its divisors is an integer number (5030402703018).

Almost surely, 2^{20121222222191} is an apocalyptic number.

20121222222191 is a deficient number, since it is larger than the sum of its proper divisors (388589881).

20121222222191 is an equidigital number, since it uses as much as digits as its factorization.

20121222222191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388589880.

The product of its (nonzero) digits is 2304, while the sum is 29.

Adding to 20121222222191 its reverse (19122222212102), we get a palindrome (39243444434293).

The spelling of 20121222222191 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred ninety-one".