31123213033012 has 24 divisors (see below), whose sum is σ = 57684206336904. Its totient is φ = 14642478630912.

The previous prime is 31123213033009. The next prime is 31123213033021. The reversal of 31123213033012 is 21033031232113.

It can be written as a sum of positive squares in 4 ways, for example, as 14866237416976 + 16256975616036 = 3855676^2 + 4031994^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58157733 + ... + 58690444.

It is an arithmetic number, because the mean of its divisors is an integer number (2403508597371).

Almost surely, 2^{31123213033012} is an apocalyptic number.

It is an amenable number.

31123213033012 is a deficient number, since it is larger than the sum of its proper divisors (26560993303892).

31123213033012 is a wasteful number, since it uses less digits than its factorization.

31123213033012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116852115 (or 116852113 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31123213033012 its reverse (21033031232113), we get a palindrome (52156244265125).

The spelling of 31123213033012 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred thirteen million, thirty-three thousand, twelve".