21484238 has 8 divisors (see below), whose sum is σ = 32511888. Its totient is φ = 10646944.

The previous prime is 21484237. The next prime is 21484241. The reversal of 21484238 is 83248412.

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 (21484237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47306 + ... + 47757.

It is an arithmetic number, because the mean of its divisors is an integer number (4063986).

Almost surely, 2^21484238 is an apocalyptic number.

21484238 is a deficient number, since it is larger than the sum of its proper divisors (11027650).

21484238 is a wasteful number, since it uses less digits than its factorization.

21484238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95178.

The product of its digits is 12288, while the sum is 32.

The square root of 21484238 is about 4635.1092759502. The cubic root of 21484238 is about 277.9969204151.

The spelling of 21484238 in words is "twenty-one million, four hundred eighty-four thousand, two hundred thirty-eight".