21045124306 has 8 divisors (see below), whose sum is σ = 31681650060. Its totient is φ = 10484574288.

The previous prime is 21045124297. The next prime is 21045124339. The reversal of 21045124306 is 60342154012.

It can be written as a sum of positive squares in 2 ways, for example, as 21027610081 + 17514225 = 145009^2 + 4185^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18993241 + ... + 18994348.

Almost surely, 2^21045124306 is an apocalyptic number.

21045124306 is a deficient number, since it is larger than the sum of its proper divisors (10636525754).

21045124306 is a wasteful number, since it uses less digits than its factorization.

21045124306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37987868.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21045124306 its reverse (60342154012), we get a palindrome (81387278318).

The spelling of 21045124306 in words is "twenty-one billion, forty-five million, one hundred twenty-four thousand, three hundred six".