31223140420 has 96 divisors (see below), whose sum is σ = 71003358720. Its totient is φ = 11492928000.

The previous prime is 31223140381. The next prime is 31223140427. The reversal of 31223140420 is 2404132213.

It is a junction number, because it is equal to n+sod(n) for n = 31223140391 and 31223140400.

It is not an unprimeable number, because it can be changed into a prime (31223140427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10557582 + ... + 10560538.

It is an arithmetic number, because the mean of its divisors is an integer number (739618320).

Almost surely, 2^31223140420 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 31223140420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35501679360).

31223140420 is an abundant number, since it is smaller than the sum of its proper divisors (39780218300).

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

31223140420 is a wasteful number, since it uses less digits than its factorization.

31223140420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773 (or 3771 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31223140420 its reverse (2404132213), we get a palindrome (33627272633).

The spelling of 31223140420 in words is "thirty-one billion, two hundred twenty-three million, one hundred forty thousand, four hundred twenty".