21648214 has 8 divisors (see below), whose sum is σ = 37111248. Its totient is φ = 9277800.

The previous prime is 21648203. The next prime is 21648217. The reversal of 21648214 is 41284612.

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 (21648217) 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, 773137 + ... + 773164.

It is an arithmetic number, because the mean of its divisors is an integer number (4638906).

Almost surely, 2^21648214 is an apocalyptic number.

21648214 is a deficient number, since it is larger than the sum of its proper divisors (15463034).

21648214 is a wasteful number, since it uses less digits than its factorization.

21648214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546310.

The product of its digits is 3072, while the sum is 28.

The square root of 21648214 is about 4652.7641246898. The cubic root of 21648214 is about 278.7023885919.

The spelling of 21648214 in words is "twenty-one million, six hundred forty-eight thousand, two hundred fourteen".