201122121121 has 4 divisors (see below), whose sum is σ = 201274603200. Its totient is φ = 200969639044.

The previous prime is 201122121103. The next prime is 201122121139. The reversal of 201122121121 is 121121221102.

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 an interprime number because it is at equal distance from previous prime (201122121103) and next prime (201122121139).

It is a cyclic number.

It is not a de Polignac number, because 201122121121 - 2¹¹ = 201122119073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201122121095 and 201122121104.

It is not an unprimeable number, because it can be changed into a prime (201125121121) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 76239061 + ... + 76241698.

It is an arithmetic number, because the mean of its divisors is an integer number (50318650800).

Almost surely, 2^201122121121 is an apocalyptic number.

It is an amenable number.

201122121121 is a deficient number, since it is larger than the sum of its proper divisors (152482079).

201122121121 is a wasteful number, since it uses less digits than its factorization.

201122121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152482078.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201122121121 its reverse (121121221102), we get a palindrome (322243342223).

The spelling of 201122121121 in words is "two hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".