51031321042 has 16 divisors (see below), whose sum is σ = 83990594520. Its totient is φ = 23108522112.

The previous prime is 51031321037. The next prime is 51031321049. The reversal of 51031321042 is 24012313015.

It is a happy number.

51031321042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 38005892401 + 13025428641 = 194951^2 + 114129^2 .

It is not an unprimeable number, because it can be changed into a prime (51031321049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18515067 + ... + 18517822.

Almost surely, 2^51031321042 is an apocalyptic number.

51031321042 is a deficient number, since it is larger than the sum of its proper divisors (32959273478).

51031321042 is a wasteful number, since it uses less digits than its factorization.

51031321042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37032957.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 51031321042 its reverse (24012313015), we get a palindrome (75043634057).

The spelling of 51031321042 in words is "fifty-one billion, thirty-one million, three hundred twenty-one thousand, forty-two".