201312113121 has 24 divisors (see below), whose sum is σ = 338595042240. Its totient is φ = 112865010336.

The previous prime is 201312113117. The next prime is 201312113147. The reversal of 201312113121 is 121311213102.

201312113121 is a `hidden beast` number, since 201 + 312 + 1 + 131 + 21 = 666.

It is not a de Polignac number, because 201312113121 - 2² = 201312113117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201312113094 and 201312113103.

It is not an unprimeable number, because it can be changed into a prime (201312113921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30142231 + ... + 30148908.

It is an arithmetic number, because the mean of its divisors is an integer number (14108126760).

Almost surely, 2^201312113121 is an apocalyptic number.

201312113121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201312113121 is a deficient number, since it is larger than the sum of its proper divisors (137282929119).

201312113121 is a wasteful number, since it uses less digits than its factorization.

201312113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60291205 (or 60291202 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 201312113121 its reverse (121311213102), we get a palindrome (322623326223).

The spelling of 201312113121 in words is "two hundred one billion, three hundred twelve million, one hundred thirteen thousand, one hundred twenty-one".