513340021 has 4 divisors (see below), whose sum is σ = 514990944. Its totient is φ = 511689100.

The previous prime is 513339947. The next prime is 513340027. The reversal of 513340021 is 120043315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 513340021 - 2¹¹ = 513337973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513340027) 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 3 ways as a sum of consecutive naturals, for example, 824995 + ... + 825616.

It is an arithmetic number, because the mean of its divisors is an integer number (128747736).

Almost surely, 2^513340021 is an apocalyptic number.

It is an amenable number.

513340021 is a deficient number, since it is larger than the sum of its proper divisors (1650923).

513340021 is a wasteful number, since it uses less digits than its factorization.

513340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650922.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 513340021 is about 22657.0082093819. The cubic root of 513340021 is about 800.6973196093.

Adding to 513340021 its reverse (120043315), we get a palindrome (633383336).

It can be divided in two parts, 5133 and 40021, that added together give a palindrome (45154).

The spelling of 513340021 in words is "five hundred thirteen million, three hundred forty thousand, twenty-one".