51201100042 has 8 divisors (see below), whose sum is σ = 76909976100. Its totient is φ = 25564441344.

The previous prime is 51201100039. The next prime is 51201100043. The reversal of 51201100042 is 24000110215.

It can be written as a sum of positive squares in 2 ways, for example, as 38200311601 + 13000788441 = 195449^2 + 114021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 51201099989 and 51201100025.

It is not an unprimeable number, because it can be changed into a prime (51201100043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18052567 + ... + 18055402.

Almost surely, 2^51201100042 is an apocalyptic number.

51201100042 is a deficient number, since it is larger than the sum of its proper divisors (25708876058).

51201100042 is a wasteful number, since it uses less digits than its factorization.

51201100042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36108680.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 51201100042 its reverse (24000110215), we get a palindrome (75201210257).

The spelling of 51201100042 in words is "fifty-one billion, two hundred one million, one hundred thousand, forty-two".