201312032121 has 12 divisors (see below), whose sum is σ = 298643075172. Its totient is φ = 130580777376.

The previous prime is 201312032099. The next prime is 201312032123. The reversal of 201312032121 is 121230213102.

201312032121 is a `hidden beast` number, since 201 + 3 + 120 + 321 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 175551782121 + 25760250000 = 418989^2 + 160500^2 .

It is not a de Polignac number, because 201312032121 - 2⁶ = 201312032057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201312032094 and 201312032103.

It is not an unprimeable number, because it can be changed into a prime (201312032123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302269986 + ... + 302270651.

It is an arithmetic number, because the mean of its divisors is an integer number (24886922931).

Almost surely, 2^201312032121 is an apocalyptic number.

It is an amenable number.

201312032121 is a deficient number, since it is larger than the sum of its proper divisors (97331043051).

201312032121 is a wasteful number, since it uses less digits than its factorization.

201312032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604540680 (or 604540677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 201312032121 its reverse (121230213102), we get a palindrome (322542245223).

The spelling of 201312032121 in words is "two hundred one billion, three hundred twelve million, thirty-two thousand, one hundred twenty-one".