31113203321 has 4 divisors (see below), whose sum is σ = 31113558372. Its totient is φ = 31112848272.

The previous prime is 31113203269. The next prime is 31113203371. The reversal of 31113203321 is 12330231113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12330231113 = 38333 ⋅321661.

It can be written as a sum of positive squares in 2 ways, for example, as 24409687696 + 6703515625 = 156236^2 + 81875^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113203321 - 2¹⁸ = 31112941177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31113203293 and 31113203302.

It is not an unprimeable number, because it can be changed into a prime (31113203371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58691 + ... + 256263.

It is an arithmetic number, because the mean of its divisors is an integer number (7778389593).

Almost surely, 2^31113203321 is an apocalyptic number.

It is an amenable number.

31113203321 is a deficient number, since it is larger than the sum of its proper divisors (355051).

31113203321 is a wasteful number, since it uses less digits than its factorization.

31113203321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355050.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31113203321 its reverse (12330231113), we get a palindrome (43443434434).

The spelling of 31113203321 in words is "thirty-one billion, one hundred thirteen million, two hundred three thousand, three hundred twenty-one".