51221236120042 has 8 divisors (see below), whose sum is σ = 76882702532832. Its totient is φ = 25593668609100.

The previous prime is 51221236120007. The next prime is 51221236120079. The reversal of 51221236120042 is 24002163212215.

It is a happy number.

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 = 51221236119986 and 51221236120013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8474721684 + ... + 8474727727.

It is an arithmetic number, because the mean of its divisors is an integer number (9610337816604).

Almost surely, 2^{51221236120042} is an apocalyptic number.

51221236120042 is a deficient number, since it is larger than the sum of its proper divisors (25661466412790).

51221236120042 is a wasteful number, since it uses less digits than its factorization.

51221236120042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16949450924.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 51221236120042 its reverse (24002163212215), we get a palindrome (75223399332257).

The spelling of 51221236120042 in words is "fifty-one trillion, two hundred twenty-one billion, two hundred thirty-six million, one hundred twenty thousand, forty-two".