21440201 has 8 divisors (see below), whose sum is σ = 21991200. Its totient is φ = 20896128.

The previous prime is 21440183. The next prime is 21440203. The reversal of 21440201 is 10204412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21440201 - 2⁶ = 21440137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4850 + ... + 8148.

It is an arithmetic number, because the mean of its divisors is an integer number (2748900).

Almost surely, 2^21440201 is an apocalyptic number.

It is an amenable number.

21440201 is a deficient number, since it is larger than the sum of its proper divisors (550999).

21440201 is an equidigital number, since it uses as much as digits as its factorization.

21440201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21440201 is about 4630.3564657594. The cubic root of 21440201 is about 277.8068504623.

Adding to 21440201 its reverse (10204412), we get a palindrome (31644613).

The spelling of 21440201 in words is "twenty-one million, four hundred forty thousand, two hundred one".