21425383 has 4 divisors (see below), whose sum is σ = 24486160. Its totient is φ = 18364608.

The previous prime is 21425377. The next prime is 21425387. The reversal of 21425383 is 38352412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21425383 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 (21425387) 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, 1530378 + ... + 1530391.

It is an arithmetic number, because the mean of its divisors is an integer number (6121540).

Almost surely, 2^21425383 is an apocalyptic number.

21425383 is a deficient number, since it is larger than the sum of its proper divisors (3060777).

21425383 is an equidigital number, since it uses as much as digits as its factorization.

21425383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060776.

The product of its digits is 5760, while the sum is 28.

The square root of 21425383 is about 4628.7560964043. The cubic root of 21425383 is about 277.7428353499.

Adding to 21425383 its reverse (38352412), we get a palindrome (59777795).

The spelling of 21425383 in words is "twenty-one million, four hundred twenty-five thousand, three hundred eighty-three".