520472021 has 2 divisors, whose sum is σ = 520472022. Its totient is φ = 520472020.

The previous prime is 520472009. The next prime is 520472041. The reversal of 520472021 is 120274025.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365344996 + 155127025 = 19114^2 + 12455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520472021 is a prime.

It is a super-2 number, since 2×520472021² = 541782249287648882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520472041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260236010 + 260236011.

It is an arithmetic number, because the mean of its divisors is an integer number (260236011).

Almost surely, 2^520472021 is an apocalyptic number.

It is an amenable number.

520472021 is a deficient number, since it is larger than the sum of its proper divisors (1).

520472021 is an equidigital number, since it uses as much as digits as its factorization.

520472021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 520472021 is about 22813.8558994309. The cubic root of 520472021 is about 804.3883944141.

The spelling of 520472021 in words is "five hundred twenty million, four hundred seventy-two thousand, twenty-one".