5205516021 has 24 divisors (see below), whose sum is σ = 7575020544. Its totient is φ = 3444573600.

The previous prime is 5205515993. The next prime is 5205516049. The reversal of 5205516021 is 1206155025.

5205516021 is a `hidden beast` number, since 5 + 2 + 0 + 5 + 51 + 602 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (5205515993) and next prime (5205516049).

It is not a de Polignac number, because 5205516021 - 2⁹ = 5205515509 is a prime.

It is a super-3 number, since 3×5205516021³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5205516061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2212996 + ... + 2215346.

It is an arithmetic number, because the mean of its divisors is an integer number (315625856).

Almost surely, 2^5205516021 is an apocalyptic number.

It is an amenable number.

5205516021 is a deficient number, since it is larger than the sum of its proper divisors (2369504523).

5205516021 is a wasteful number, since it uses less digits than its factorization.

5205516021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081 (or 4078 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 5205516021 is about 72149.2620960187. The cubic root of 5205516021 is about 1733.0905830619.

The spelling of 5205516021 in words is "five billion, two hundred five million, five hundred sixteen thousand, twenty-one".