31121202223 has 8 divisors (see below), whose sum is σ = 31825453616. Its totient is φ = 30423211200.

The previous prime is 31121202163. The next prime is 31121202239. The reversal of 31121202223 is 32220212113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121202223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31121202223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121202523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1555038 + ... + 1574923.

It is an arithmetic number, because the mean of its divisors is an integer number (3978181702).

Almost surely, 2^31121202223 is an apocalyptic number.

31121202223 is a deficient number, since it is larger than the sum of its proper divisors (704251393).

31121202223 is a wasteful number, since it uses less digits than its factorization.

31121202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130185.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31121202223 its reverse (32220212113), we get a palindrome (63341414336).

The spelling of 31121202223 in words is "thirty-one billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-three".