21450064 has 20 divisors (see below), whose sum is σ = 41783040. Its totient is φ = 10667360.

The previous prime is 21450061. The next prime is 21450083. The reversal of 21450064 is 46005412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450061) by changing a digit.

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, 454 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (2089152).

Almost surely, 2^21450064 is an apocalyptic number.

It is an amenable number.

21450064 is a deficient number, since it is larger than the sum of its proper divisors (20332976).

21450064 is a wasteful number, since it uses less digits than its factorization.

21450064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7218 (or 7212 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21450064 is about 4631.4213800949. The cubic root of 21450064 is about 277.8494431743.

Adding to 21450064 its reverse (46005412), we get a palindrome (67455476).

The spelling of 21450064 in words is "twenty-one million, four hundred fifty thousand, sixty-four".