21492663 has 8 divisors (see below), whose sum is σ = 28694400. Its totient is φ = 14309688.

The previous prime is 21492659. The next prime is 21492727. The reversal of 21492663 is 36629412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21492663 - 2² = 21492659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492643) 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 in 7 ways as a sum of consecutive naturals, for example, 1753 + ... + 6786.

It is an arithmetic number, because the mean of its divisors is an integer number (3586800).

Almost surely, 2^21492663 is an apocalyptic number.

21492663 is a deficient number, since it is larger than the sum of its proper divisors (7201737).

21492663 is an equidigital number, since it uses as much as digits as its factorization.

21492663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9381.

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

The square root of 21492663 is about 4636.0180111816. The cubic root of 21492663 is about 278.0332543074.

It can be divided in two parts, 21492 and 663, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21492663 in words is "twenty-one million, four hundred ninety-two thousand, six hundred sixty-three".