21966463 has 2 divisors, whose sum is σ = 21966464. Its totient is φ = 21966462.

The previous prime is 21966401. The next prime is 21966481. The reversal of 21966463 is 36466912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21966463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21963463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10983231 + 10983232.

It is an arithmetic number, because the mean of its divisors is an integer number (10983232).

Almost surely, 2^21966463 is an apocalyptic number.

21966463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21966463 is an equidigital number, since it uses as much as digits as its factorization.

21966463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 21966463 is about 4686.8393401097. The cubic root of 21966463 is about 280.0614788472.

The spelling of 21966463 in words is "twenty-one million, nine hundred sixty-six thousand, four hundred sixty-three".