52121718 has 60 divisors (see below), whose sum is σ = 128422140. Its totient is φ = 15788520.

The previous prime is 52121687. The next prime is 52121723. The reversal of 52121718 is 81712125.

52121718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 52121691 and 52121700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 18273 + ... + 20931.

It is an arithmetic number, because the mean of its divisors is an integer number (2140369).

Almost surely, 2^52121718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52121718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64211070).

52121718 is an abundant number, since it is smaller than the sum of its proper divisors (76300422).

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

52121718 is a wasteful number, since it uses less digits than its factorization.

52121718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695 (or 2675 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 52121718 is about 7219.5372427878. The cubic root of 52121718 is about 373.5421155393.

The spelling of 52121718 in words is "fifty-two million, one hundred twenty-one thousand, seven hundred eighteen".