450628021 has 2 divisors, whose sum is σ = 450628022. Its totient is φ = 450628020.

The previous prime is 450627979. The next prime is 450628037. The reversal of 450628021 is 120826054.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341843121 + 108784900 = 18489^2 + 10430^2 .

It is a cyclic number.

It is not a de Polignac number, because 450628021 - 2⁹ = 450627509 is a prime.

It is a super-2 number, since 2×450628021² = 406131226620752882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450628091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225314010 + 225314011.

It is an arithmetic number, because the mean of its divisors is an integer number (225314011).

Almost surely, 2^450628021 is an apocalyptic number.

It is an amenable number.

450628021 is a deficient number, since it is larger than the sum of its proper divisors (1).

450628021 is an equidigital number, since it uses as much as digits as its factorization.

450628021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 450628021 is about 21228.0008714905. Note that the first 3 decimals coincide. The cubic root of 450628021 is about 766.6657543993.

The spelling of 450628021 in words is "four hundred fifty million, six hundred twenty-eight thousand, twenty-one".