21065463 has 6 divisors (see below), whose sum is σ = 30427904. Its totient is φ = 14043636.

The previous prime is 21065459. The next prime is 21065477. The reversal of 21065463 is 36456012.

21065463 is a `hidden beast` number, since 2 + 1 + 0 + 654 + 6 + 3 = 666.

It is not a de Polignac number, because 21065463 - 2² = 21065459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21065413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1170295 + ... + 1170312.

Almost surely, 2^21065463 is an apocalyptic number.

21065463 is a deficient number, since it is larger than the sum of its proper divisors (9362441).

21065463 is a wasteful number, since it uses less digits than its factorization.

21065463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340613 (or 2340610 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 21065463 is about 4589.7127361089. The cubic root of 21065463 is about 276.1787987641.

It can be divided in two parts, 21065 and 463, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21065463 in words is "twenty-one million, sixty-five thousand, four hundred sixty-three".