21427064 has 8 divisors (see below), whose sum is σ = 40175760. Its totient is φ = 10713528.

The previous prime is 21427039. The next prime is 21427073. The reversal of 21427064 is 46072412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339184 + ... + 1339199.

It is an arithmetic number, because the mean of its divisors is an integer number (5021970).

Almost surely, 2^21427064 is an apocalyptic number.

It is an amenable number.

21427064 is a deficient number, since it is larger than the sum of its proper divisors (18748696).

21427064 is a wasteful number, since it uses less digits than its factorization.

21427064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678389 (or 2678385 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21427064 is about 4628.9376751043. The cubic root of 21427064 is about 277.7500989072.

Adding to 21427064 its reverse (46072412), we get a palindrome (67499476).

The spelling of 21427064 in words is "twenty-one million, four hundred twenty-seven thousand, sixty-four".