21005221714 has 16 divisors (see below), whose sum is σ = 32107178520. Its totient is φ = 10302888960.

The previous prime is 21005221663. The next prime is 21005221751. The reversal of 21005221714 is 41712250012.

It can be written as a sum of positive squares in 4 ways, for example, as 20971384225 + 33837489 = 144815^2 + 5817^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031794 + ... + 1051954.

Almost surely, 2^21005221714 is an apocalyptic number.

21005221714 is a deficient number, since it is larger than the sum of its proper divisors (11101956806).

21005221714 is a wasteful number, since it uses less digits than its factorization.

21005221714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30045.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 21005221714 its reverse (41712250012), we get a palindrome (62717471726).

The spelling of 21005221714 in words is "twenty-one billion, five million, two hundred twenty-one thousand, seven hundred fourteen".