31312032121 has 8 divisors (see below), whose sum is σ = 31863252320. Its totient is φ = 30763279008.

The previous prime is 31312032107. The next prime is 31312032137. The reversal of 31312032121 is 12123021313.

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 31312032121 - 2¹¹ = 31312030073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312032181) 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, 591156 + ... + 641941.

It is an arithmetic number, because the mean of its divisors is an integer number (3982906540).

Almost surely, 2^31312032121 is an apocalyptic number.

It is an amenable number.

31312032121 is a deficient number, since it is larger than the sum of its proper divisors (551220199).

31312032121 is a wasteful number, since it uses less digits than its factorization.

31312032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233543.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31312032121 its reverse (12123021313), we get a palindrome (43435053434).

The spelling of 31312032121 in words is "thirty-one billion, three hundred twelve million, thirty-two thousand, one hundred twenty-one".