21414393 has 48 divisors (see below), whose sum is σ = 41548416. Its totient is φ = 10264320.

The previous prime is 21414391. The next prime is 21414401. The reversal of 21414393 is 39341412.

It is not a de Polignac number, because 21414393 - 2¹ = 21414391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21414391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7821 + ... + 10197.

It is an arithmetic number, because the mean of its divisors is an integer number (865592).

Almost surely, 2^21414393 is an apocalyptic number.

It is an amenable number.

21414393 is a deficient number, since it is larger than the sum of its proper divisors (20134023).

21414393 is a wasteful number, since it uses less digits than its factorization.

21414393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414 (or 2411 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21414393 is about 4627.5688001368. The cubic root of 21414393 is about 277.6953384812.

It can be divided in two parts, 21 and 414393, that added together give a palindrome (414414).

The spelling of 21414393 in words is "twenty-one million, four hundred fourteen thousand, three hundred ninety-three".