74330021 has 2 divisors, whose sum is σ = 74330022. Its totient is φ = 74330020.

The previous prime is 74330017. The next prime is 74330023. The reversal of 74330021 is 12003347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 2927521 = 8450^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 74330021 - 2² = 74330017 is a prime.

Together with 74330023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 74329975 and 74330002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74330023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37165010 + 37165011.

It is an arithmetic number, because the mean of its divisors is an integer number (37165011).

Almost surely, 2^74330021 is an apocalyptic number.

It is an amenable number.

74330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74330021 is an equidigital number, since it uses as much as digits as its factorization.

74330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 74330021 is about 8621.4860088038. The cubic root of 74330021 is about 420.4568366270.

Adding to 74330021 its reverse (12003347), we get a palindrome (86333368).

The spelling of 74330021 in words is "seventy-four million, three hundred thirty thousand, twenty-one".