53121433530 has 256 divisors, whose sum is σ = 149717237760. Its totient is φ = 11935795200.

The previous prime is 53121433529. The next prime is 53121433571. The reversal of 53121433530 is 3533412135.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 40643137 + ... + 40644443.

It is an arithmetic number, because the mean of its divisors is an integer number (584832960).

Almost surely, 2^53121433530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53121433530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74858618880).

53121433530 is an abundant number, since it is smaller than the sum of its proper divisors (96595804230).

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

53121433530 is a wasteful number, since it uses less digits than its factorization.

53121433530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525.

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 53121433530 its reverse (3533412135), we get a palindrome (56654845665).

The spelling of 53121433530 in words is "fifty-three billion, one hundred twenty-one million, four hundred thirty-three thousand, five hundred thirty".