201211000121 has 6 divisors (see below), whose sum is σ = 208388563422. Its totient is φ = 194272688960.

The previous prime is 201211000033. The next prime is 201211000147. The reversal of 201211000121 is 121000112102.

It can be written as a sum of positive squares in 3 ways, for example, as 449652025 + 200761348096 = 21205^2 + 448064^2 .

It is a de Polignac number, because none of the positive numbers 2^k-201211000121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201211000181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119625200 + ... + 119626881.

It is an arithmetic number, because the mean of its divisors is an integer number (34731427237).

Almost surely, 2^201211000121 is an apocalyptic number.

It is an amenable number.

201211000121 is a deficient number, since it is larger than the sum of its proper divisors (7177563301).

201211000121 is an equidigital number, since it uses as much as digits as its factorization.

201211000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239252139 (or 239252110 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201211000121 its reverse (121000112102), we get a palindrome (322211112223).

The spelling of 201211000121 in words is "two hundred one billion, two hundred eleven million, one hundred twenty-one", and thus it is an aban number.