73221311 has 2 divisors, whose sum is σ = 73221312. Its totient is φ = 73221310.

The previous prime is 73221299. The next prime is 73221319. The reversal of 73221311 is 11312237.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73221311 - 2¹⁴ = 73204927 is a prime.

It is a super-2 number, since 2×73221311² = 10722720769117442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73221319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36610655 + 36610656.

It is an arithmetic number, because the mean of its divisors is an integer number (36610656).

Almost surely, 2^73221311 is an apocalyptic number.

73221311 is a deficient number, since it is larger than the sum of its proper divisors (1).

73221311 is an equidigital number, since it uses as much as digits as its factorization.

73221311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 73221311 is about 8556.9451908961. The cubic root of 73221311 is about 418.3558377266.

Adding to 73221311 its reverse (11312237), we get a palindrome (84533548).

The spelling of 73221311 in words is "seventy-three million, two hundred twenty-one thousand, three hundred eleven".