21559514 has 4 divisors (see below), whose sum is σ = 32339274. Its totient is φ = 10779756.

The previous prime is 21559513. The next prime is 21559523. The reversal of 21559514 is 41595512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 537289 = 4585^2 + 733^2 .

It is not an unprimeable number, because it can be changed into a prime (21559513) 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 as a sum of consecutive naturals, namely, 5389877 + ... + 5389880.

Almost surely, 2^21559514 is an apocalyptic number.

21559514 is a deficient number, since it is larger than the sum of its proper divisors (10779760).

21559514 is a wasteful number, since it uses less digits than its factorization.

21559514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10779759.

The product of its digits is 9000, while the sum is 32.

The square root of 21559514 is about 4643.2223724478. Note that the first 3 decimals coincide. The cubic root of 21559514 is about 278.3212217789.

The spelling of 21559514 in words is "twenty-one million, five hundred fifty-nine thousand, five hundred fourteen".