21339463 has 2 divisors, whose sum is σ = 21339464. Its totient is φ = 21339462.

The previous prime is 21339407. The next prime is 21339467. The reversal of 21339463 is 36493312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21339463 - 2⁹ = 21338951 is a prime.

It is a super-2 number, since 2×21339463² = 910745362256738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21339467) 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, 10669731 + 10669732.

It is an arithmetic number, because the mean of its divisors is an integer number (10669732).

Almost surely, 2^21339463 is an apocalyptic number.

21339463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21339463 is an equidigital number, since it uses as much as digits as its factorization.

21339463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 31.

The square root of 21339463 is about 4619.4656617405. The cubic root of 21339463 is about 277.3710701559.

The spelling of 21339463 in words is "twenty-one million, three hundred thirty-nine thousand, four hundred sixty-three".