52121061720 has 384 divisors, whose sum is σ = 212926371840. Its totient is φ = 10762675200.

The previous prime is 52121061697. The next prime is 52121061743. The reversal of 52121061720 is 2716012125.

52121061720 is a `hidden beast` number, since 5 + 2 + 1 + 21 + 0 + 617 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (52121061697) and next prime (52121061743).

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 95 ways as a sum of consecutive naturals, for example, 1522795 + ... + 1556645.

It is an arithmetic number, because the mean of its divisors is an integer number (554495760).

Almost surely, 2^52121061720 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 52121061720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106463185920).

52121061720 is an abundant number, since it is smaller than the sum of its proper divisors (160805310120).

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

52121061720 is a wasteful number, since it uses less digits than its factorization.

52121061720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33935 (or 33928 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 52121061720 its reverse (2716012125), we get a palindrome (54837073845).

The spelling of 52121061720 in words is "fifty-two billion, one hundred twenty-one million, sixty-one thousand, seven hundred twenty".