52021312 has 56 divisors (see below), whose sum is σ = 118912640. Its totient is φ = 22118400.

The previous prime is 52021261. The next prime is 52021313. The reversal of 52021312 is 21312025.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (52021313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67264 + ... + 68032.

It is an arithmetic number, because the mean of its divisors is an integer number (2123440).

Almost surely, 2^52021312 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 52021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59456320).

52021312 is an abundant number, since it is smaller than the sum of its proper divisors (66891328).

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

52021312 is a wasteful number, since it uses less digits than its factorization.

52021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 52021312 is about 7212.5801208721. The cubic root of 52021312 is about 373.3021005618.

Adding to 52021312 its reverse (21312025), we get a palindrome (73333337).

The spelling of 52021312 in words is "fifty-two million, twenty-one thousand, three hundred twelve".