122194208138 has 4 divisors (see below), whose sum is σ = 183291312210. Its totient is φ = 61097104068.

The previous prime is 122194208137. The next prime is 122194208209. The reversal of 122194208138 is 831802491221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831802491221 = 13 ⋅63984807017.

It can be written as a sum of positive squares in only one way, i.e., 67976482729 + 54217725409 = 260723^2 + 232847^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 122194208095 and 122194208104.

It is not an unprimeable number, because it can be changed into a prime (122194208137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30548552033 + ... + 30548552036.

Almost surely, 2^122194208138 is an apocalyptic number.

122194208138 is a deficient number, since it is larger than the sum of its proper divisors (61097104072).

122194208138 is an equidigital number, since it uses as much as digits as its factorization.

122194208138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61097104071.

The product of its (nonzero) digits is 55296, while the sum is 41.

Adding to 122194208138 its reverse (831802491221), we get a palindrome (953996699359).

The spelling of 122194208138 in words is "one hundred twenty-two billion, one hundred ninety-four million, two hundred eight thousand, one hundred thirty-eight".