31031220011223 has 32 divisors (see below), whose sum is σ = 42074329522176. Its totient is φ = 20340753205248.

The previous prime is 31031220011213. The next prime is 31031220011243. The reversal of 31031220011223 is 32211002213013.

It is not a de Polignac number, because 31031220011223 - 2⁶ = 31031220011159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31031220011223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031220011203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 461623711 + ... + 461690927.

It is an arithmetic number, because the mean of its divisors is an integer number (1314822797568).

Almost surely, 2^{31031220011223} is an apocalyptic number.

31031220011223 is a deficient number, since it is larger than the sum of its proper divisors (11043109510953).

31031220011223 is a wasteful number, since it uses less digits than its factorization.

31031220011223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78183.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31031220011223 its reverse (32211002213013), we get a palindrome (63242222224236).

The spelling of 31031220011223 in words is "thirty-one trillion, thirty-one billion, two hundred twenty million, eleven thousand, two hundred twenty-three".