21450001 has 16 divisors (see below), whose sum is σ = 22809600. Its totient is φ = 20150208.

The previous prime is 21449959. The next prime is 21450019. The reversal of 21450001 is 10005412.

It is a cyclic number.

It is not a de Polignac number, because 21450001 - 2¹¹ = 21447953 is a prime.

It is a Duffinian number.

21450001 is a Rhonda number in base 8.

It is not an unprimeable number, because it can be changed into a prime (21450061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196735 + ... + 196843.

It is an arithmetic number, because the mean of its divisors is an integer number (1425600).

Almost surely, 2^21450001 is an apocalyptic number.

It is an amenable number.

21450001 is a deficient number, since it is larger than the sum of its proper divisors (1359599).

21450001 is a wasteful number, since it uses less digits than its factorization.

21450001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 21450001 is about 4631.4145787221. The cubic root of 21450001 is about 277.8491711544.

Adding to 21450001 its reverse (10005412), we get a palindrome (31455413).

The spelling of 21450001 in words is "twenty-one million, four hundred fifty thousand, one".