21124200002 has 8 divisors (see below), whose sum is σ = 31717706700. Its totient is φ = 10551631104.

The previous prime is 21124199977. The next prime is 21124200007. The reversal of 21124200002 is 20000242112.

It can be written as a sum of positive squares in 2 ways, for example, as 20853959281 + 270240721 = 144409^2 + 16439^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21124200002.

It is not an unprimeable number, because it can be changed into a prime (21124200007) by changing a digit.

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, 5231927 + ... + 5235962.

Almost surely, 2^21124200002 is an apocalyptic number.

21124200002 is a deficient number, since it is larger than the sum of its proper divisors (10593506698).

21124200002 is a wasteful number, since it uses less digits than its factorization.

21124200002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10468900.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21124200002 its reverse (20000242112), we get a palindrome (41124442114).

The spelling of 21124200002 in words is "twenty-one billion, one hundred twenty-four million, two hundred thousand, two".