31242012012 has 60 divisors (see below), whose sum is σ = 81805258920. Its totient is φ = 10397113344.

The previous prime is 31242012007. The next prime is 31242012049. The reversal of 31242012012 is 21021024213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122668 + ... + 278444.

It is an arithmetic number, because the mean of its divisors is an integer number (1363420982).

Almost surely, 2^31242012012 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 31242012012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40902629460).

31242012012 is an abundant number, since it is smaller than the sum of its proper divisors (50563246908).

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

31242012012 is a wasteful number, since it uses less digits than its factorization.

31242012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156412 (or 156401 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31242012012 its reverse (21021024213), we get a palindrome (52263036225).

It can be divided in two parts, 3124201 and 2012, that added together give a palindrome (3126213).

The spelling of 31242012012 in words is "thirty-one billion, two hundred forty-two million, twelve thousand, twelve".