14400021 has 4 divisors (see below), whose sum is σ = 19200032. Its totient is φ = 9600012.

The previous prime is 14400019. The next prime is 14400059. The reversal of 14400021 is 12000441.

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.

It is not a de Polignac number, because 14400021 - 2¹ = 14400019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14400011) 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, 2400001 + ... + 2400006.

It is an arithmetic number, because the mean of its divisors is an integer number (4800008).

Almost surely, 2^14400021 is an apocalyptic number.

It is an amenable number.

14400021 is a deficient number, since it is larger than the sum of its proper divisors (4800011).

14400021 is an equidigital number, since it uses as much as digits as its factorization.

14400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800010.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 14400021 is about 3794.7359591940. The cubic root of 14400021 is about 243.2881980879.

Adding to 14400021 its reverse (12000441), we get a palindrome (26400462).

The spelling of 14400021 in words is "fourteen million, four hundred thousand, twenty-one".