31031223203121 has 8 divisors (see below), whose sum is σ = 43173875760960. Its totient is φ = 19788026390352.

The previous prime is 31031223203087. The next prime is 31031223203147. The reversal of 31031223203121 is 12130232213013.

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

It is not a de Polignac number, because 31031223203121 - 2¹⁰ = 31031223202097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31031223203091 and 31031223203100.

It is not an unprimeable number, because it can be changed into a prime (31031223203191) 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, 224863936186 + ... + 224863936323.

It is an arithmetic number, because the mean of its divisors is an integer number (5396734470120).

Almost surely, 2^{31031223203121} is an apocalyptic number.

It is an amenable number.

31031223203121 is a deficient number, since it is larger than the sum of its proper divisors (12142652557839).

31031223203121 is a wasteful number, since it uses less digits than its factorization.

31031223203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449727872535.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 31031223203121 its reverse (12130232213013), we get a palindrome (43161455416134).

The spelling of 31031223203121 in words is "thirty-one trillion, thirty-one billion, two hundred twenty-three million, two hundred three thousand, one hundred twenty-one".