451022221 has 16 divisors (see below), whose sum is σ = 492683184. Its totient is φ = 410402304.

The previous prime is 451022219. The next prime is 451022233. The reversal of 451022221 is 122220154.

It can be written as a sum of positive squares in 8 ways, for example, as 16924996 + 434097225 = 4114^2 + 20835^2 .

It is not a de Polignac number, because 451022221 - 2¹ = 451022219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451022261) 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, 278811 + ... + 280423.

It is an arithmetic number, because the mean of its divisors is an integer number (30792699).

Almost surely, 2^451022221 is an apocalyptic number.

It is an amenable number.

451022221 is a deficient number, since it is larger than the sum of its proper divisors (41660963).

451022221 is a wasteful number, since it uses less digits than its factorization.

451022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 451022221 is about 21237.2837481633. The cubic root of 451022221 is about 766.8892436513.

Adding to 451022221 its reverse (122220154), we get a palindrome (573242375).

The spelling of 451022221 in words is "four hundred fifty-one million, twenty-two thousand, two hundred twenty-one".