201212200122121 has 4 divisors (see below), whose sum is σ = 208150551850500. Its totient is φ = 194273848393744.

The previous prime is 201212200122091. The next prime is 201212200122137. The reversal of 201212200122121 is 121221002212102.

201212200122121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 114279606346896 + 86932593775225 = 10690164^2 + 9323765^2 .

It is a cyclic number.

It is not a de Polignac number, because 201212200122121 - 2⁹ = 201212200121609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201212200122191) 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, 3469175864146 + ... + 3469175864203.

It is an arithmetic number, because the mean of its divisors is an integer number (52037637962625).

Almost surely, 2^{201212200122121} is an apocalyptic number.

It is an amenable number.

201212200122121 is a deficient number, since it is larger than the sum of its proper divisors (6938351728379).

201212200122121 is an equidigital number, since it uses as much as digits as its factorization.

201212200122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938351728378.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201212200122121 its reverse (121221002212102), we get a palindrome (322433202334223).

The spelling of 201212200122121 in words is "two hundred one trillion, two hundred twelve billion, two hundred million, one hundred twenty-two thousand, one hundred twenty-one".