202021122194 has 4 divisors (see below), whose sum is σ = 303031683294. Its totient is φ = 101010561096.

The previous prime is 202021122181. The next prime is 202021122239. The reversal of 202021122194 is 491221120202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 491221120202 = 2 ⋅245610560101.

It can be written as a sum of positive squares in only one way, i.e., 200215977025 + 1805145169 = 447455^2 + 42487^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50505280547 + ... + 50505280550.

Almost surely, 2^202021122194 is an apocalyptic number.

202021122194 is a deficient number, since it is larger than the sum of its proper divisors (101010561100).

202021122194 is a wasteful number, since it uses less digits than its factorization.

202021122194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101010561099.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 202021122194 its reverse (491221120202), we get a palindrome (693242242396).

The spelling of 202021122194 in words is "two hundred two billion, twenty-one million, one hundred twenty-two thousand, one hundred ninety-four".