512683173221 has 4 divisors (see below), whose sum is σ = 513584198700. Its totient is φ = 511782147744.

The previous prime is 512683173203. The next prime is 512683173229. The reversal of 512683173221 is 122371386215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85769908225 + 426913264996 = 292865^2 + 653386^2 .

It is a cyclic number.

It is not a de Polignac number, because 512683173221 - 2¹⁸ = 512682911077 is a prime.

It is a super-2 number, since 2×512683173221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512683173229) 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, 450511886 + ... + 450513023.

It is an arithmetic number, because the mean of its divisors is an integer number (128396049675).

Almost surely, 2^512683173221 is an apocalyptic number.

It is an amenable number.

512683173221 is a deficient number, since it is larger than the sum of its proper divisors (901025479).

512683173221 is an equidigital number, since it uses as much as digits as its factorization.

512683173221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901025478.

The product of its digits is 120960, while the sum is 41.

The spelling of 512683173221 in words is "five hundred twelve billion, six hundred eighty-three million, one hundred seventy-three thousand, two hundred twenty-one".