21342583 has 2 divisors, whose sum is σ = 21342584. Its totient is φ = 21342582.

The previous prime is 21342557. The next prime is 21342631. The reversal of 21342583 is 38524312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21342583 - 2⁹ = 21342071 is a prime.

It is a super-2 number, since 2×21342583² = 911011698223778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671291 + 10671292.

It is an arithmetic number, because the mean of its divisors is an integer number (10671292).

Almost surely, 2^21342583 is an apocalyptic number.

21342583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342583 is an equidigital number, since it uses as much as digits as its factorization.

21342583 is an evil number, because the sum of its binary digits is even.

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

The square root of 21342583 is about 4619.8033507932. The cubic root of 21342583 is about 277.3845874527.

Adding to 21342583 its reverse (38524312), we get a palindrome (59866895).

The spelling of 21342583 in words is "twenty-one million, three hundred forty-two thousand, five hundred eighty-three".