21647014 has 4 divisors (see below), whose sum is σ = 32470524. Its totient is φ = 10823506.

The previous prime is 21647011. The next prime is 21647047. The reversal of 21647014 is 41074612.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21647014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21647011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5411752 + ... + 5411755.

It is an arithmetic number, because the mean of its divisors is an integer number (8117631).

Almost surely, 2^21647014 is an apocalyptic number.

21647014 is a deficient number, since it is larger than the sum of its proper divisors (10823510).

21647014 is a wasteful number, since it uses less digits than its factorization.

21647014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10823509.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21647014 is about 4652.6351673004. The cubic root of 21647014 is about 278.6972388361.

The spelling of 21647014 in words is "twenty-one million, six hundred forty-seven thousand, fourteen".