51221012024 has 96 divisors (see below), whose sum is σ = 120442140000. Its totient is φ = 20241527040.

The previous prime is 51221012023. The next prime is 51221012071. The reversal of 51221012024 is 42021012215.

51221012024 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51221011987 and 51221012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221012023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5249102 + ... + 5258850.

It is an arithmetic number, because the mean of its divisors is an integer number (1254605625).

Almost surely, 2^51221012024 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 51221012024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60221070000).

51221012024 is an abundant number, since it is smaller than the sum of its proper divisors (69221127976).

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

51221012024 is a wasteful number, since it uses less digits than its factorization.

51221012024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10813 (or 10802 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 51221012024 its reverse (42021012215), we get a palindrome (93242024239).

The spelling of 51221012024 in words is "fifty-one billion, two hundred twenty-one million, twelve thousand, twenty-four".