21124463 has 2 divisors, whose sum is σ = 21124464. Its totient is φ = 21124462.

The previous prime is 21124459. The next prime is 21124469. The reversal of 21124463 is 36442112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21124463 - 2² = 21124459 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562231 + 10562232.

It is an arithmetic number, because the mean of its divisors is an integer number (10562232).

Almost surely, 2^21124463 is an apocalyptic number.

21124463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124463 is an equidigital number, since it uses as much as digits as its factorization.

21124463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 21124463 is about 4596.1356594426. The cubic root of 21124463 is about 276.4363982956.

Adding to 21124463 its reverse (36442112), we get a palindrome (57566575).

The spelling of 21124463 in words is "twenty-one million, one hundred twenty-four thousand, four hundred sixty-three".