500231021 has 4 divisors (see below), whose sum is σ = 500435772. Its totient is φ = 500026272.

The previous prime is 500230981. The next prime is 500231027. The reversal of 500231021 is 120132005.

It is a happy number.

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 450033796 + 50197225 = 21214^2 + 7085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500231021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 500230987 and 500231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500231027) 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, 98666 + ... + 103611.

It is an arithmetic number, because the mean of its divisors is an integer number (125108943).

Almost surely, 2^500231021 is an apocalyptic number.

It is an amenable number.

500231021 is a deficient number, since it is larger than the sum of its proper divisors (204751).

500231021 is a wasteful number, since it uses less digits than its factorization.

500231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204750.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 500231021 is about 22365.8449650354. The cubic root of 500231021 is about 793.8227481549.

Adding to 500231021 its reverse (120132005), we get a palindrome (620363026).

The spelling of 500231021 in words is "five hundred million, two hundred thirty-one thousand, twenty-one".