31035312121 has 8 divisors (see below), whose sum is σ = 33865610688. Its totient is φ = 28206498000.

The previous prime is 31035311999. The next prime is 31035312157. The reversal of 31035312121 is 12121353013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31035312121 - 2²³ = 31026923513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31035312092 and 31035312101.

It is not an unprimeable number, because it can be changed into a prime (31035310121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327165 + ... + 411226.

It is an arithmetic number, because the mean of its divisors is an integer number (4233201336).

Almost surely, 2^31035312121 is an apocalyptic number.

It is an amenable number.

31035312121 is a deficient number, since it is larger than the sum of its proper divisors (2830298567).

31035312121 is a wasteful number, since it uses less digits than its factorization.

31035312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742223.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 31035312121 its reverse (12121353013), we get a palindrome (43156665134).

The spelling of 31035312121 in words is "thirty-one billion, thirty-five million, three hundred twelve thousand, one hundred twenty-one".