52021512 has 24 divisors (see below), whose sum is σ = 140891790. Its totient is φ = 17340480.

The previous prime is 52021511. The next prime is 52021523. The reversal of 52021512 is 21512025.

It can be written as a sum of positive squares in only one way, i.e., 48358116 + 3663396 = 6954^2 + 1914^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×52021512² = 5412475421532288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (52021511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361189 + ... + 361332.

Almost surely, 2^52021512 is an apocalyptic number.

It is an amenable number.

52021512 is an abundant number, since it is smaller than the sum of its proper divisors (88870278).

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

52021512 is a wasteful number, since it uses less digits than its factorization.

52021512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722533 (or 722526 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 52021512 is about 7212.5939855228. The cubic root of 52021512 is about 373.3025789575.

Adding to 52021512 its reverse (21512025), we get a palindrome (73533537).

The spelling of 52021512 in words is "fifty-two million, twenty-one thousand, five hundred twelve".