74212321 has 2 divisors, whose sum is σ = 74212322. Its totient is φ = 74212320.

The previous prime is 74212319. The next prime is 74212331. The reversal of 74212321 is 12321247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 921600 = 8561^2 + 960^2 .

It is an emirp because it is prime and its reverse (12321247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74212321 - 2¹ = 74212319 is a prime.

Together with 74212319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 74212292 and 74212301.

It is not a weakly prime, because it can be changed into another prime (74212331) 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 as a sum of consecutive naturals, namely, 37106160 + 37106161.

It is an arithmetic number, because the mean of its divisors is an integer number (37106161).

Almost surely, 2^74212321 is an apocalyptic number.

It is an amenable number.

74212321 is a deficient number, since it is larger than the sum of its proper divisors (1).

74212321 is an equidigital number, since it uses as much as digits as its factorization.

74212321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 74212321 is about 8614.6573350308. The cubic root of 74212321 is about 420.2347912455.

Adding to 74212321 its reverse (12321247), we get a palindrome (86533568).

The spelling of 74212321 in words is "seventy-four million, two hundred twelve thousand, three hundred twenty-one".