51215428842 has 8 divisors (see below), whose sum is σ = 102430857696. Its totient is φ = 17071809612.

The previous prime is 51215428837. The next prime is 51215428843. The reversal of 51215428842 is 24882451215.

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

51215428842 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 51215428794 and 51215428803.

It is not an unprimeable number, because it can be changed into a prime (51215428843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4267952398 + ... + 4267952409.

It is an arithmetic number, because the mean of its divisors is an integer number (12803857212).

Almost surely, 2^51215428842 is an apocalyptic number.

51215428842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51215428842 is a wasteful number, since it uses less digits than its factorization.

51215428842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8535904812.

The product of its digits is 204800, while the sum is 42.

The spelling of 51215428842 in words is "fifty-one billion, two hundred fifteen million, four hundred twenty-eight thousand, eight hundred forty-two".