21710064 has 20 divisors (see below), whose sum is σ = 56084456. Its totient is φ = 7236672.

The previous prime is 21710057. The next prime is 21710111. The reversal of 21710064 is 46001712.

It is a self number, because there is not a number n which added to its sum of digits gives 21710064.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226099 + ... + 226194.

Almost surely, 2^21710064 is an apocalyptic number.

21710064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21710064 is an abundant number, since it is smaller than the sum of its proper divisors (34374392).

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

21710064 is a wasteful number, since it uses less digits than its factorization.

21710064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452304 (or 452298 counting only the distinct ones).

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

The square root of 21710064 is about 4659.4059707220. The cubic root of 21710064 is about 278.9675583096.

Adding to 21710064 its reverse (46001712), we get a palindrome (67711776).

The spelling of 21710064 in words is "twenty-one million, seven hundred ten thousand, sixty-four".