31011223012 has 192 divisors, whose sum is σ = 72250859520. Its totient is φ = 11290752000.

The previous prime is 31011223007. The next prime is 31011223037. The reversal of 31011223012 is 21032211013.

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 63 ways as a sum of consecutive naturals, for example, 63677833 + ... + 63678319.

It is an arithmetic number, because the mean of its divisors is an integer number (376306560).

Almost surely, 2^31011223012 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 31011223012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36125429760).

31011223012 is an abundant number, since it is smaller than the sum of its proper divisors (41239636508).

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

31011223012 is a wasteful number, since it uses less digits than its factorization.

31011223012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31011223012 its reverse (21032211013), we get a palindrome (52043434025).

The spelling of 31011223012 in words is "thirty-one billion, eleven million, two hundred twenty-three thousand, twelve".