21424583 has 4 divisors (see below), whose sum is σ = 21516768. Its totient is φ = 21332400.

The previous prime is 21424577. The next prime is 21424589. The reversal of 21424583 is 38542412.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21424577) and next prime (21424589).

It is a cyclic number.

It is not a de Polignac number, because 21424583 - 2⁸ = 21424327 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 (21424589) 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, 45743 + ... + 46208.

It is an arithmetic number, because the mean of its divisors is an integer number (5379192).

Almost surely, 2^21424583 is an apocalyptic number.

21424583 is a deficient number, since it is larger than the sum of its proper divisors (92185).

21424583 is an equidigital number, since it uses as much as digits as its factorization.

21424583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92184.

The product of its digits is 7680, while the sum is 29.

The square root of 21424583 is about 4628.6696792923. The cubic root of 21424583 is about 277.7393784372.

Adding to 21424583 its reverse (38542412), we get a palindrome (59966995).

The spelling of 21424583 in words is "twenty-one million, four hundred twenty-four thousand, five hundred eighty-three".