21827494 has 8 divisors (see below), whose sum is σ = 35259840. Its totient is φ = 10074216.

The previous prime is 21827489. The next prime is 21827497. The reversal of 21827494 is 49472812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21827497) 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, 419734 + ... + 419785.

It is an arithmetic number, because the mean of its divisors is an integer number (4407480).

Almost surely, 2^21827494 is an apocalyptic number.

21827494 is a deficient number, since it is larger than the sum of its proper divisors (13432346).

21827494 is a wasteful number, since it uses less digits than its factorization.

21827494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839534.

The product of its digits is 32256, while the sum is 37.

The square root of 21827494 is about 4671.9903681408. The cubic root of 21827494 is about 279.4696337883.

The spelling of 21827494 in words is "twenty-one million, eight hundred twenty-seven thousand, four hundred ninety-four".