516522021 has 8 divisors (see below), whose sum is σ = 688802400. Its totient is φ = 344294832.

The previous prime is 516522007. The next prime is 516522043. The reversal of 516522021 is 120225615.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-516522021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 516521982 and 516522000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516522001) 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, 25726 + ... + 41168.

It is an arithmetic number, because the mean of its divisors is an integer number (86100300).

Almost surely, 2^516522021 is an apocalyptic number.

It is an amenable number.

516522021 is a deficient number, since it is larger than the sum of its proper divisors (172280379).

516522021 is a wasteful number, since it uses less digits than its factorization.

516522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26595.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 516522021 is about 22727.1208251287. The cubic root of 516522021 is about 802.3483192718.

Adding to 516522021 its reverse (120225615), we get a palindrome (636747636).

The spelling of 516522021 in words is "five hundred sixteen million, five hundred twenty-two thousand, twenty-one".