21670014 has 8 divisors (see below), whose sum is σ = 43340040. Its totient is φ = 7223336.

The previous prime is 21670009. The next prime is 21670031. The reversal of 21670014 is 41007612.

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

21670014 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 1805829 + ... + 1805840.

It is an arithmetic number, because the mean of its divisors is an integer number (5417505).

Almost surely, 2^21670014 is an apocalyptic number.

21670014 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21670014 is a wasteful number, since it uses less digits than its factorization.

21670014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611674.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21670014 is about 4655.1062286483. The cubic root of 21670014 is about 278.7959093749.

Adding to 21670014 its reverse (41007612), we get a palindrome (62677626).

The spelling of 21670014 in words is "twenty-one million, six hundred seventy thousand, fourteen".