201211233121 has 4 divisors (see below), whose sum is σ = 201447120532. Its totient is φ = 200975345712.

The previous prime is 201211233089. The next prime is 201211233137. The reversal of 201211233121 is 121332112102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18147053521 + 183064179600 = 134711^2 + 427860^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211233121 - 2⁵ = 201211233089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201211233151) 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, 117942426 + ... + 117944131.

It is an arithmetic number, because the mean of its divisors is an integer number (50361780133).

Almost surely, 2^201211233121 is an apocalyptic number.

It is an amenable number.

201211233121 is a deficient number, since it is larger than the sum of its proper divisors (235887411).

201211233121 is an equidigital number, since it uses as much as digits as its factorization.

201211233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235887410.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 201211233121 its reverse (121332112102), we get a palindrome (322543345223).

The spelling of 201211233121 in words is "two hundred one billion, two hundred eleven million, two hundred thirty-three thousand, one hundred twenty-one".