31123330221330 has 24 divisors (see below), whose sum is σ = 80920658575692. Its totient is φ = 8299554725664.

The previous prime is 31123330221317. The next prime is 31123330221337. The reversal of 31123330221330 is 3312203332113.

31123330221330 is a `hidden beast` number, since 3 + 1 + 1 + 2 + 3 + 3 + 302 + 21 + 330 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29988536440041 + 1134793781289 = 5476179^2 + 1065267^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31123330221294 and 31123330221303.

It is not an unprimeable number, because it can be changed into a prime (31123330221337) 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, 172907390029 + ... + 172907390208.

Almost surely, 2^{31123330221330} is an apocalyptic number.

31123330221330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31123330221330 is an abundant number, since it is smaller than the sum of its proper divisors (49797328354362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31123330221330 is a wasteful number, since it uses less digits than its factorization.

31123330221330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345814780250 (or 345814780247 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 27.

Adding to 31123330221330 its reverse (3312203332113), we get a palindrome (34435533553443).

The spelling of 31123330221330 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred thirty million, two hundred twenty-one thousand, three hundred thirty".