201121220112121 has 4 divisors (see below), whose sum is σ = 201434005836112. Its totient is φ = 200808434388132.

The previous prime is 201121220112119. The next prime is 201121220112157. The reversal of 201121220112121 is 121211022121102.

It is a happy number.

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 201121220112121 - 2¹ = 201121220112119 is a prime.

It is a super-2 number, since 2×201121220112121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121220112521) 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, 156392861031 + ... + 156392862316.

It is an arithmetic number, because the mean of its divisors is an integer number (50358501459028).

Almost surely, 2^{201121220112121} is an apocalyptic number.

It is an amenable number.

201121220112121 is a deficient number, since it is larger than the sum of its proper divisors (312785723991).

201121220112121 is an equidigital number, since it uses as much as digits as its factorization.

201121220112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312785723990.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201121220112121 its reverse (121211022121102), we get a palindrome (322332242233223).

The spelling of 201121220112121 in words is "two hundred one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".