31120221113 has 4 divisors (see below), whose sum is σ = 31138539600. Its totient is φ = 31101902628.

The previous prime is 31120221089. The next prime is 31120221149. The reversal of 31120221113 is 31112202113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31120221113 - 2²⁶ = 31053112249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31120221091 and 31120221100.

It is not an unprimeable number, because it can be changed into a prime (31120211113) 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, 9156695 + ... + 9160092.

It is an arithmetic number, because the mean of its divisors is an integer number (7784634900).

Almost surely, 2^31120221113 is an apocalyptic number.

It is an amenable number.

31120221113 is a deficient number, since it is larger than the sum of its proper divisors (18318487).

31120221113 is a wasteful number, since it uses less digits than its factorization.

31120221113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18318486.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31120221113 its reverse (31112202113), we get a palindrome (62232423226).

The spelling of 31120221113 in words is "thirty-one billion, one hundred twenty million, two hundred twenty-one thousand, one hundred thirteen".