53021550 has 48 divisors (see below), whose sum is σ = 132491520. Its totient is φ = 14031840.

The previous prime is 53021543. The next prime is 53021587. The reversal of 53021550 is 5512035.

53021550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×53021550² = 5622569528805000, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 19579 + ... + 22121.

It is an arithmetic number, because the mean of its divisors is an integer number (2760240).

Almost surely, 2^53021550 is an apocalyptic number.

53021550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 53021550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66245760).

53021550 is an abundant number, since it is smaller than the sum of its proper divisors (79469970).

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

53021550 is a wasteful number, since it uses less digits than its factorization.

53021550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697 (or 2692 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 53021550 is about 7281.5897989381. The cubic root of 53021550 is about 375.6794791889.

Adding to 53021550 its reverse (5512035), we get a palindrome (58533585).

The spelling of 53021550 in words is "fifty-three million, twenty-one thousand, five hundred fifty".