450512021 has 4 divisors (see below), whose sum is σ = 474223200. Its totient is φ = 426800844.

The previous prime is 450511993. The next prime is 450512039. The reversal of 450512021 is 120215054.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120215054 = 2 ⋅60107527.

It is a cyclic number.

It is not a de Polignac number, because 450512021 - 2¹⁰ = 450510997 is a prime.

It is a super-2 number, since 2×450512021² = 405922162131008882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 450511984 and 450512002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450512081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11855561 + ... + 11855598.

It is an arithmetic number, because the mean of its divisors is an integer number (118555800).

Almost surely, 2^450512021 is an apocalyptic number.

It is an amenable number.

450512021 is a deficient number, since it is larger than the sum of its proper divisors (23711179).

450512021 is a wasteful number, since it uses less digits than its factorization.

450512021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23711178.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 450512021 is about 21225.2684553105. The cubic root of 450512021 is about 766.5999640981.

Adding to 450512021 its reverse (120215054), we get a palindrome (570727075).

The spelling of 450512021 in words is "four hundred fifty million, five hundred twelve thousand, twenty-one".