520903021 has 8 divisors (see below), whose sum is σ = 532364544. Its totient is φ = 509457360.

The previous prime is 520903007. The next prime is 520903049. The reversal of 520903021 is 120309025.

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

It is a cyclic number.

It is not a de Polignac number, because 520903021 - 2¹⁵ = 520870253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520902983 and 520903001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520903081) 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, 83031 + ... + 89083.

It is an arithmetic number, because the mean of its divisors is an integer number (66545568).

Almost surely, 2^520903021 is an apocalyptic number.

It is an amenable number.

520903021 is a deficient number, since it is larger than the sum of its proper divisors (11461523).

520903021 is a wasteful number, since it uses less digits than its factorization.

520903021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 520903021 is about 22823.2999585949. The cubic root of 520903021 is about 804.6103696790.

The spelling of 520903021 in words is "five hundred twenty million, nine hundred three thousand, twenty-one".