31423123212 has 24 divisors (see below), whose sum is σ = 78960668976. Its totient is φ = 9668653248.

The previous prime is 31423123157. The next prime is 31423123223. The reversal of 31423123212 is 21232132413.

It is a nude number because it is divisible by every one of its digits.

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 7 ways as a sum of consecutive naturals, for example, 100714983 + ... + 100715294.

It is an arithmetic number, because the mean of its divisors is an integer number (3290027874).

Almost surely, 2^31423123212 is an apocalyptic number.

It is an amenable number.

31423123212 is an abundant number, since it is smaller than the sum of its proper divisors (47537545764).

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

31423123212 is a wasteful number, since it uses less digits than its factorization.

31423123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201430297 (or 201430295 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 31423123212 its reverse (21232132413), we get a palindrome (52655255625).

The spelling of 31423123212 in words is "thirty-one billion, four hundred twenty-three million, one hundred twenty-three thousand, two hundred twelve".