51440321424 has 80 divisors (see below), whose sum is σ = 134477920640. Its totient is φ = 16942141440.

The previous prime is 51440321419. The next prime is 51440321431. The reversal of 51440321424 is 42412304415.

It is a super-2 number, since 2×51440321424² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51440321391 and 51440321400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2929182 + ... + 2946690.

It is an arithmetic number, because the mean of its divisors is an integer number (1680974008).

Almost surely, 2^51440321424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51440321424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67238960320).

51440321424 is an abundant number, since it is smaller than the sum of its proper divisors (83037599216).

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

51440321424 is a wasteful number, since it uses less digits than its factorization.

51440321424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18248 (or 18242 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 51440321424 its reverse (42412304415), we get a palindrome (93852625839).

The spelling of 51440321424 in words is "fifty-one billion, four hundred forty million, three hundred twenty-one thousand, four hundred twenty-four".