513211021 has 4 divisors (see below), whose sum is σ = 514240000. Its totient is φ = 512182044.

The previous prime is 513211003. The next prime is 513211037. The reversal of 513211021 is 120112315.

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 513211021 - 2¹¹ = 513208973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513210986 and 513211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513211091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513741 + ... + 514738.

It is an arithmetic number, because the mean of its divisors is an integer number (128560000).

Almost surely, 2^513211021 is an apocalyptic number.

It is an amenable number.

513211021 is a deficient number, since it is larger than the sum of its proper divisors (1028979).

513211021 is a wasteful number, since it uses less digits than its factorization.

513211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028978.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 513211021 is about 22654.1612292312. The cubic root of 513211021 is about 800.6302434653.

Adding to 513211021 its reverse (120112315), we get a palindrome (633323336).

The spelling of 513211021 in words is "five hundred thirteen million, two hundred eleven thousand, twenty-one".