31121020223 has 8 divisors (see below), whose sum is σ = 31522455360. Its totient is φ = 30721692960.

The previous prime is 31121020219. The next prime is 31121020237. The reversal of 31121020223 is 32202012113.

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

It is a cyclic number.

It is not a de Polignac number, because 31121020223 - 2² = 31121020219 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 (31121020253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497240 + ... + 556317.

It is an arithmetic number, because the mean of its divisors is an integer number (3940306920).

Almost surely, 2^31121020223 is an apocalyptic number.

31121020223 is a deficient number, since it is larger than the sum of its proper divisors (401435137).

31121020223 is a wasteful number, since it uses less digits than its factorization.

31121020223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053937.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31121020223 its reverse (32202012113), we get a palindrome (63323032336).

The spelling of 31121020223 in words is "thirty-one billion, one hundred twenty-one million, twenty thousand, two hundred twenty-three".