51113221440 has 112 divisors (see below), whose sum is σ = 163318618752. Its totient is φ = 13543335936.

The previous prime is 51113221387. The next prime is 51113221457. The reversal of 51113221440 is 4412231115.

It is a super-2 number, since 2×51113221440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 51113221440.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18844 + ... + 320283.

Almost surely, 2^51113221440 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 51113221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81659309376).

51113221440 is an abundant number, since it is smaller than the sum of its proper divisors (112205397312).

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

51113221440 is a wasteful number, since it uses less digits than its factorization.

51113221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339304 (or 339294 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 51113221440 its reverse (4412231115), we get a palindrome (55525452555).

The spelling of 51113221440 in words is "fifty-one billion, one hundred thirteen million, two hundred twenty-one thousand, four hundred forty".