21542083 has 2 divisors, whose sum is σ = 21542084. Its totient is φ = 21542082.

The previous prime is 21542071. The next prime is 21542093. The reversal of 21542083 is 38024512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21542083 - 2¹³ = 21533891 is a prime.

It is a super-2 number, since 2×21542083² = 928122679957778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21542063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10771041 + 10771042.

It is an arithmetic number, because the mean of its divisors is an integer number (10771042).

Almost surely, 2^21542083 is an apocalyptic number.

21542083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21542083 is an equidigital number, since it uses as much as digits as its factorization.

21542083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21542083 is about 4641.3449559368. The cubic root of 21542083 is about 278.2461934136.

Adding to 21542083 its reverse (38024512), we get a palindrome (59566595).

The spelling of 21542083 in words is "twenty-one million, five hundred forty-two thousand, eighty-three".