513012021 has 16 divisors (see below), whose sum is σ = 697144320. Its totient is φ = 335469680.

The previous prime is 513012007. The next prime is 513012029. The reversal of 513012021 is 120210315.

It is a cyclic number.

It is not a de Polignac number, because 513012021 - 2⁷ = 513011893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83956 + ... + 89858.

It is an arithmetic number, because the mean of its divisors is an integer number (43571520).

Almost surely, 2^513012021 is an apocalyptic number.

It is an amenable number.

513012021 is a deficient number, since it is larger than the sum of its proper divisors (184132299).

513012021 is a wasteful number, since it uses less digits than its factorization.

513012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 513012021 is about 22649.7686743154. The cubic root of 513012021 is about 800.5267473662.

Adding to 513012021 its reverse (120210315), we get a palindrome (633222336).

The spelling of 513012021 in words is "five hundred thirteen million, twelve thousand, twenty-one".