21463147 has 2 divisors, whose sum is σ = 21463148. Its totient is φ = 21463146.

The previous prime is 21463133. The next prime is 21463153. The reversal of 21463147 is 74136412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21463147 - 2⁷ = 21463019 is a prime.

It is not a weakly prime, because it can be changed into another prime (21463177) 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, 10731573 + 10731574.

It is an arithmetic number, because the mean of its divisors is an integer number (10731574).

Almost surely, 2^21463147 is an apocalyptic number.

21463147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21463147 is an equidigital number, since it uses as much as digits as its factorization.

21463147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 21463147 is about 4632.8335821611. The cubic root of 21463147 is about 277.9059211015.

Adding to 21463147 its reverse (74136412), we get a palindrome (95599559).

The spelling of 21463147 in words is "twenty-one million, four hundred sixty-three thousand, one hundred forty-seven".