21276463 has 4 divisors (see below), whose sum is σ = 22913128. Its totient is φ = 19639800.

The previous prime is 21276461. The next prime is 21276467. The reversal of 21276463 is 36467212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21276463 - 2¹ = 21276461 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 (21276461) 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 in 3 ways as a sum of consecutive naturals, for example, 818313 + ... + 818338.

It is an arithmetic number, because the mean of its divisors is an integer number (5728282).

Almost surely, 2^21276463 is an apocalyptic number.

21276463 is a deficient number, since it is larger than the sum of its proper divisors (1636665).

21276463 is a wasteful number, since it uses less digits than its factorization.

21276463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636664.

The product of its digits is 12096, while the sum is 31.

The square root of 21276463 is about 4612.6416509415. The cubic root of 21276463 is about 277.0978423794.

The spelling of 21276463 in words is "twenty-one million, two hundred seventy-six thousand, four hundred sixty-three".