201122212121 has 4 divisors (see below), whose sum is σ = 205799472912. Its totient is φ = 196444951332.

The previous prime is 201122212117. The next prime is 201122212139. The reversal of 201122212121 is 121212221102.

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 201122212121 - 2² = 201122212117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201122212121.

It is not an unprimeable number, because it can be changed into a prime (201122212111) 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, 2338630331 + ... + 2338630416.

It is an arithmetic number, because the mean of its divisors is an integer number (51449868228).

Almost surely, 2^201122212121 is an apocalyptic number.

It is an amenable number.

201122212121 is a deficient number, since it is larger than the sum of its proper divisors (4677260791).

201122212121 is an equidigital number, since it uses as much as digits as its factorization.

201122212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677260790.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201122212121 its reverse (121212221102), we get a palindrome (322334433223).

The spelling of 201122212121 in words is "two hundred one billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".