605213021 has 4 divisors (see below), whose sum is σ = 691672032. Its totient is φ = 518754012.

The previous prime is 605212991. The next prime is 605213027. The reversal of 605213021 is 120312506.

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 not a de Polignac number, because 605213021 - 2¹⁴ = 605196637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 605212984 and 605213002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605213027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43229495 + ... + 43229508.

It is an arithmetic number, because the mean of its divisors is an integer number (172918008).

Almost surely, 2^605213021 is an apocalyptic number.

It is an amenable number.

605213021 is a deficient number, since it is larger than the sum of its proper divisors (86459011).

605213021 is an equidigital number, since it uses as much as digits as its factorization.

605213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86459010.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 605213021 is about 24601.0776389978. The cubic root of 605213021 is about 845.8683094911.

Adding to 605213021 its reverse (120312506), we get a palindrome (725525527).

The spelling of 605213021 in words is "six hundred five million, two hundred thirteen thousand, twenty-one".