73221451 has 4 divisors (see below), whose sum is σ = 73242952. Its totient is φ = 73199952.

The previous prime is 73221437. The next prime is 73221481. The reversal of 73221451 is 15412237.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73221451 - 2¹⁵ = 73188683 is a prime.

It is a super-2 number, since 2×73221451² = 10722761773090802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73221481) 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 in 3 ways as a sum of consecutive naturals, for example, 4386 + ... + 12871.

It is an arithmetic number, because the mean of its divisors is an integer number (18310738).

Almost surely, 2^73221451 is an apocalyptic number.

73221451 is a deficient number, since it is larger than the sum of its proper divisors (21501).

73221451 is a wasteful number, since it uses less digits than its factorization.

73221451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21500.

The product of its digits is 1680, while the sum is 25.

The square root of 73221451 is about 8556.9533713817. The cubic root of 73221451 is about 418.3561043602.

Adding to 73221451 its reverse (15412237), we get a palindrome (88633688).

The spelling of 73221451 in words is "seventy-three million, two hundred twenty-one thousand, four hundred fifty-one".