31223234420 has 96 divisors (see below), whose sum is σ = 76228846848. Its totient is φ = 10521418752.

The previous prime is 31223234407. The next prime is 31223234461. The reversal of 31223234420 is 2443232213.

It is a self number, because there is not a number n which added to its sum of digits gives 31223234420.

It is a congruent number.

It is an unprimeable number.

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, 2989247 + ... + 2999673.

It is an arithmetic number, because the mean of its divisors is an integer number (794050488).

Almost surely, 2^31223234420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31223234420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38114423424).

31223234420 is an abundant number, since it is smaller than the sum of its proper divisors (45005612428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31223234420 is a wasteful number, since it uses less digits than its factorization.

31223234420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10809 (or 10807 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 31223234420 its reverse (2443232213), we get a palindrome (33666466633).

The spelling of 31223234420 in words is "thirty-one billion, two hundred twenty-three million, two hundred thirty-four thousand, four hundred twenty".