51521245140 has 192 divisors, whose sum is σ = 153280512000. Its totient is φ = 12910410240.

The previous prime is 51521245099. The next prime is 51521245141. The reversal of 51521245140 is 4154212515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51521245098 and 51521245107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521245141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9757021 + ... + 9762299.

It is an arithmetic number, because the mean of its divisors is an integer number (798336000).

Almost surely, 2^51521245140 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 51521245140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76640256000).

51521245140 is an abundant number, since it is smaller than the sum of its proper divisors (101759266860).

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

51521245140 is a wasteful number, since it uses less digits than its factorization.

51521245140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470 (or 5468 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 51521245140 its reverse (4154212515), we get a palindrome (55675457655).

The spelling of 51521245140 in words is "fifty-one billion, five hundred twenty-one million, two hundred forty-five thousand, one hundred forty".