451221212 has 18 divisors (see below), whose sum is σ = 855052128. Its totient is φ = 208255632.

The previous prime is 451221163. The next prime is 451221217. The reversal of 451221212 is 212122154.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451221217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333068 + ... + 334419.

It is an arithmetic number, because the mean of its divisors is an integer number (47502896).

Almost surely, 2^451221212 is an apocalyptic number.

It is an amenable number.

451221212 is a deficient number, since it is larger than the sum of its proper divisors (403830916).

451221212 is a wasteful number, since it uses less digits than its factorization.

451221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667517 (or 667502 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 451221212 is about 21241.9681762308. The cubic root of 451221212 is about 767.0020109111.

Adding to 451221212 its reverse (212122154), we get a palindrome (663343366).

The spelling of 451221212 in words is "four hundred fifty-one million, two hundred twenty-one thousand, two hundred twelve".