31121120223 has 12 divisors (see below), whose sum is σ = 44954306488. Its totient is φ = 20746685520.

The previous prime is 31121120197. The next prime is 31121120263. The reversal of 31121120223 is 32202112113.

It is not a de Polignac number, because 31121120223 - 2¹² = 31121116127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121120196 and 31121120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121120263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 374028 + ... + 449598.

Almost surely, 2^31121120223 is an apocalyptic number.

31121120223 is a deficient number, since it is larger than the sum of its proper divisors (13833186265).

31121120223 is a wasteful number, since it uses less digits than its factorization.

31121120223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121334 (or 121331 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31121120223 its reverse (32202112113), we get a palindrome (63323232336).

The spelling of 31121120223 in words is "thirty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty-three".