451221321 has 16 divisors (see below), whose sum is σ = 613324800. Its totient is φ = 294991248.

The previous prime is 451221313. The next prime is 451221343. The reversal of 451221321 is 123122154.

It is not a de Polignac number, because 451221321 - 2³ = 451221313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (451221301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74800 + ... + 80606.

It is an arithmetic number, because the mean of its divisors is an integer number (38332800).

Almost surely, 2^451221321 is an apocalyptic number.

It is an amenable number.

451221321 is a deficient number, since it is larger than the sum of its proper divisors (162103479).

451221321 is a wasteful number, since it uses less digits than its factorization.

451221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6308.

The product of its digits is 480, while the sum is 21.

The square root of 451221321 is about 21241.9707419062. The cubic root of 451221321 is about 767.0020726718.

Adding to 451221321 its reverse (123122154), we get a palindrome (574343475).

The spelling of 451221321 in words is "four hundred fifty-one million, two hundred twenty-one thousand, three hundred twenty-one".