21704106 has 8 divisors (see below), whose sum is σ = 43408224. Its totient is φ = 7234700.

The previous prime is 21704101. The next prime is 21704107. The reversal of 21704106 is 60140712.

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

21704106 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21704101) 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, 1808670 + ... + 1808681.

It is an arithmetic number, because the mean of its divisors is an integer number (5426028).

Almost surely, 2^21704106 is an apocalyptic number.

21704106 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.

21704106 is a wasteful number, since it uses less digits than its factorization.

21704106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3617356.

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

The square root of 21704106 is about 4658.7665749638. The cubic root of 21704106 is about 278.9420364935.

Adding to 21704106 its reverse (60140712), we get a palindrome (81844818).

The spelling of 21704106 in words is "twenty-one million, seven hundred four thousand, one hundred six".