21426383 has 4 divisors (see below), whose sum is σ = 23374248. Its totient is φ = 19478520.

The previous prime is 21426371. The next prime is 21426401. The reversal of 21426383 is 38362412.

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

It is a cyclic number.

It is not a de Polignac number, because 21426383 - 2¹⁸ = 21164239 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 (21426343) 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, 973916 + ... + 973937.

It is an arithmetic number, because the mean of its divisors is an integer number (5843562).

Almost surely, 2^21426383 is an apocalyptic number.

21426383 is a deficient number, since it is larger than the sum of its proper divisors (1947865).

21426383 is a wasteful number, since it uses less digits than its factorization.

21426383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947864.

The product of its digits is 6912, while the sum is 29.

The square root of 21426383 is about 4628.8641155255. The cubic root of 21426383 is about 277.7471563697.

Adding to 21426383 its reverse (38362412), we get a palindrome (59788795).

The spelling of 21426383 in words is "twenty-one million, four hundred twenty-six thousand, three hundred eighty-three".