21383417 has 16 divisors (see below), whose sum is σ = 24822720. Its totient is φ = 18216000.

The previous prime is 21383413. The next prime is 21383419. The reversal of 21383417 is 71438312.

It is not a de Polignac number, because 21383417 - 2² = 21383413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21383417.

It is not an unprimeable number, because it can be changed into a prime (21383413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20603 + ... + 21615.

It is an arithmetic number, because the mean of its divisors is an integer number (1551420).

Almost surely, 2^21383417 is an apocalyptic number.

It is an amenable number.

21383417 is a deficient number, since it is larger than the sum of its proper divisors (3439303).

21383417 is a wasteful number, since it uses less digits than its factorization.

21383417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144.

The product of its digits is 4032, while the sum is 29.

The square root of 21383417 is about 4624.2206911003. The cubic root of 21383417 is about 277.5613780852.

It can be divided in two parts, 2138 and 3417, that added together give a palindrome (5555).

The spelling of 21383417 in words is "twenty-one million, three hundred eighty-three thousand, four hundred seventeen".