21181483 has 2 divisors, whose sum is σ = 21181484. Its totient is φ = 21181482.

The previous prime is 21181477. The next prime is 21181487. The reversal of 21181483 is 38418112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21181483 - 2⁵ = 21181451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21181487) 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, 10590741 + 10590742.

It is an arithmetic number, because the mean of its divisors is an integer number (10590742).

Almost surely, 2^21181483 is an apocalyptic number.

21181483 is a deficient number, since it is larger than the sum of its proper divisors (1).

21181483 is an equidigital number, since it uses as much as digits as its factorization.

21181483 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 28.

The square root of 21181483 is about 4602.3345163080. The cubic root of 21181483 is about 276.6848975906.

Adding to 21181483 its reverse (38418112), we get a palindrome (59599595).

The spelling of 21181483 in words is "twenty-one million, one hundred eighty-one thousand, four hundred eighty-three".