21440101 has 8 divisors (see below), whose sum is σ = 22058784. Its totient is φ = 20826960.

The previous prime is 21440099. The next prime is 21440119. The reversal of 21440101 is 10104412.

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

It is a cyclic number.

It is not a de Polignac number, because 21440101 - 2¹ = 21440099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440801) 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, 7206 + ... + 9736.

It is an arithmetic number, because the mean of its divisors is an integer number (2757348).

Almost surely, 2^21440101 is an apocalyptic number.

It is an amenable number.

21440101 is a deficient number, since it is larger than the sum of its proper divisors (618683).

21440101 is a wasteful number, since it uses less digits than its factorization.

21440101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21440101 is about 4630.3456674421. The cubic root of 21440101 is about 277.8064185520.

Adding to 21440101 its reverse (10104412), we get a palindrome (31544513).

The spelling of 21440101 in words is "twenty-one million, four hundred forty thousand, one hundred one".