601330021 has 2 divisors, whose sum is σ = 601330022. Its totient is φ = 601330020.

The previous prime is 601330019. The next prime is 601330039. The reversal of 601330021 is 120033106.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556252225 + 45077796 = 23585^2 + 6714^2 .

It is a cyclic number.

It is not a de Polignac number, because 601330021 - 2¹ = 601330019 is a prime.

Together with 601330019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 601329977 and 601330004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (601330061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300665010 + 300665011.

It is an arithmetic number, because the mean of its divisors is an integer number (300665011).

Almost surely, 2^601330021 is an apocalyptic number.

It is an amenable number.

601330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

601330021 is an equidigital number, since it uses as much as digits as its factorization.

601330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 601330021 is about 24522.0313391856. The cubic root of 601330021 is about 844.0554182406.

Adding to 601330021 its reverse (120033106), we get a palindrome (721363127).

The spelling of 601330021 in words is "six hundred one million, three hundred thirty thousand, twenty-one".