21727064 has 16 divisors (see below), whose sum is σ = 40864200. Its totient is φ = 10829952.

The previous prime is 21727009. The next prime is 21727081. The reversal of 21727064 is 46072712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334 + ... + 6725.

Almost surely, 2^21727064 is an apocalyptic number.

It is an amenable number.

21727064 is a deficient number, since it is larger than the sum of its proper divisors (19137136).

21727064 is a wasteful number, since it uses less digits than its factorization.

21727064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8402 (or 8398 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21727064 is about 4661.2298806216. The cubic root of 21727064 is about 279.0403542131.

Adding to 21727064 its reverse (46072712), we get a palindrome (67799776).

The spelling of 21727064 in words is "twenty-one million, seven hundred twenty-seven thousand, sixty-four".