31123213110223 has 4 divisors (see below), whose sum is σ = 33517306426408. Its totient is φ = 28729119794040.

The previous prime is 31123213110163. The next prime is 31123213110257. The reversal of 31123213110223 is 32201131232113.

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

It is a cyclic number.

It is not a de Polignac number, because 31123213110223 - 2¹³ = 31123213102031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123213110323) 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, 1197046658073 + ... + 1197046658098.

It is an arithmetic number, because the mean of its divisors is an integer number (8379326606602).

Almost surely, 2^{31123213110223} is an apocalyptic number.

31123213110223 is a deficient number, since it is larger than the sum of its proper divisors (2394093316185).

31123213110223 is a wasteful number, since it uses less digits than its factorization.

31123213110223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394093316184.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31123213110223 its reverse (32201131232113), we get a palindrome (63324344342336).

The spelling of 31123213110223 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred thirteen million, one hundred ten thousand, two hundred twenty-three".