21269463 has 4 divisors (see below), whose sum is σ = 28359288. Its totient is φ = 14179640.

The previous prime is 21269449. The next prime is 21269467. The reversal of 21269463 is 36496212.

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 21269463 - 2¹⁸ = 21007319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21269467) 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, 3544908 + ... + 3544913.

It is an arithmetic number, because the mean of its divisors is an integer number (7089822).

Almost surely, 2^21269463 is an apocalyptic number.

21269463 is a deficient number, since it is larger than the sum of its proper divisors (7089825).

21269463 is an equidigital number, since it uses as much as digits as its factorization.

21269463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7089824.

The product of its digits is 15552, while the sum is 33.

The square root of 21269463 is about 4611.8828042352. The cubic root of 21269463 is about 277.0674504599.

The spelling of 21269463 in words is "twenty-one million, two hundred sixty-nine thousand, four hundred sixty-three".