122212121212191 has 4 divisors (see below), whose sum is σ = 162949494949592. Its totient is φ = 81474747474792.

The previous prime is 122212121212189. The next prime is 122212121212199. The reversal of 122212121212191 is 191212121212221.

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

It is not a de Polignac number, because 122212121212191 - 2¹ = 122212121212189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122212121212199) 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, 20368686868696 + ... + 20368686868701.

It is an arithmetic number, because the mean of its divisors is an integer number (40737373737398).

Almost surely, 2^{122212121212191} is an apocalyptic number.

122212121212191 is a deficient number, since it is larger than the sum of its proper divisors (40737373737401).

122212121212191 is an equidigital number, since it uses as much as digits as its factorization.

122212121212191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40737373737400.

The product of its digits is 1152, while the sum is 30.

Adding to 122212121212191 its sum of digits (30), we get a palindrome (122212121212221).

The spelling of 122212121212191 in words is "one hundred twenty-two trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred ninety-one".