450000021 has 16 divisors (see below), whose sum is σ = 617541120. Its totient is φ = 291352560.

The previous prime is 450000017. The next prime is 450000029. The reversal of 450000021 is 120000054.

It is not a de Polignac number, because 450000021 - 2² = 450000017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 449999961 and 450000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450000029) 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, 625 + ... + 30006.

It is an arithmetic number, because the mean of its divisors is an integer number (38596320).

Almost surely, 2^450000021 is an apocalyptic number.

It is an amenable number.

450000021 is a deficient number, since it is larger than the sum of its proper divisors (167541099).

450000021 is a wasteful number, since it uses less digits than its factorization.

450000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30776.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 450000021 is about 21213.2039305712. The cubic root of 450000021 is about 766.3094443139.

Adding to 450000021 its reverse (120000054), we get a palindrome (570000075).

The spelling of 450000021 in words is "four hundred fifty million, twenty-one", and thus it is an aban number.