73421321 has 4 divisors (see below), whose sum is σ = 73653252. Its totient is φ = 73189392.

The previous prime is 73421303. The next prime is 73421333. The reversal of 73421321 is 12312437.

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 12503296 + 60918025 = 3536^2 + 7805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73421321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73421371) 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, 115490 + ... + 116123.

It is an arithmetic number, because the mean of its divisors is an integer number (18413313).

Almost surely, 2^73421321 is an apocalyptic number.

It is an amenable number.

73421321 is a deficient number, since it is larger than the sum of its proper divisors (231931).

73421321 is a wasteful number, since it uses less digits than its factorization.

73421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231930.

The product of its digits is 1008, while the sum is 23.

The square root of 73421321 is about 8568.6242186246. The cubic root of 73421321 is about 418.7364158065.

Adding to 73421321 its reverse (12312437), we get a palindrome (85733758).

The spelling of 73421321 in words is "seventy-three million, four hundred twenty-one thousand, three hundred twenty-one".