31330013121 has 48 divisors (see below), whose sum is σ = 52025688000. Its totient is φ = 17968158720.

The previous prime is 31330013093. The next prime is 31330013129. The reversal of 31330013121 is 12131003313.

It is a happy number.

31330013121 is a `hidden beast` number, since 313 + 300 + 1 + 31 + 21 = 666.

It is not a de Polignac number, because 31330013121 - 2¹¹ = 31330011073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31330013094 and 31330013103.

It is not an unprimeable number, because it can be changed into a prime (31330013129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1738485 + ... + 1756413.

It is an arithmetic number, because the mean of its divisors is an integer number (1083868500).

Almost surely, 2^31330013121 is an apocalyptic number.

It is an amenable number.

31330013121 is a deficient number, since it is larger than the sum of its proper divisors (20695674879).

31330013121 is a wasteful number, since it uses less digits than its factorization.

31330013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18894 (or 18891 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31330013121 its reverse (12131003313), we get a palindrome (43461016434).

The spelling of 31330013121 in words is "thirty-one billion, three hundred thirty million, thirteen thousand, one hundred twenty-one".