31033120312011 has 4 divisors (see below), whose sum is σ = 41377493749352. Its totient is φ = 20688746874672.

The previous prime is 31033120312009. The next prime is 31033120312027. The reversal of 31033120312011 is 11021302133013.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31033120312011 - 2¹ = 31033120312009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31033120312081) 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, 5172186718666 + ... + 5172186718671.

It is an arithmetic number, because the mean of its divisors is an integer number (10344373437338).

Almost surely, 2^{31033120312011} is an apocalyptic number.

31033120312011 is a deficient number, since it is larger than the sum of its proper divisors (10344373437341).

31033120312011 is a wasteful number, since it uses less digits than its factorization.

31033120312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344373437340.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 31033120312011 its reverse (11021302133013), we get a palindrome (42054422445024).

The spelling of 31033120312011 in words is "thirty-one trillion, thirty-three billion, one hundred twenty million, three hundred twelve thousand, eleven".