73321421 has 2 divisors, whose sum is σ = 73321422. Its totient is φ = 73321420.

The previous prime is 73321403. The next prime is 73321439. The reversal of 73321421 is 12412337.

It is a balanced prime because it is at equal distance from previous prime (73321403) and next prime (73321439).

It can be written as a sum of positive squares in only one way, i.e., 42640900 + 30680521 = 6530^2 + 5539^2 .

It is a cyclic number.

It is not a de Polignac number, because 73321421 - 2¹⁸ = 73059277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73321481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36660710 + 36660711.

It is an arithmetic number, because the mean of its divisors is an integer number (36660711).

Almost surely, 2^73321421 is an apocalyptic number.

It is an amenable number.

73321421 is a deficient number, since it is larger than the sum of its proper divisors (1).

73321421 is an equidigital number, since it uses as much as digits as its factorization.

73321421 is an evil number, because the sum of its binary digits is even.

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

The square root of 73321421 is about 8562.7928271096. The cubic root of 73321421 is about 418.5464130734.

Adding to 73321421 its reverse (12412337), we get a palindrome (85733758).

The spelling of 73321421 in words is "seventy-three million, three hundred twenty-one thousand, four hundred twenty-one".