21044140210 has 8 divisors (see below), whose sum is σ = 37879452396. Its totient is φ = 8417656080.

The previous prime is 21044140199. The next prime is 21044140219. The reversal of 21044140210 is 1204144012.

It can be written as a sum of positive squares in 2 ways, for example, as 20276905609 + 767234601 = 142397^2 + 27699^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21044140219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052207001 + ... + 1052207020.

Almost surely, 2^21044140210 is an apocalyptic number.

21044140210 is a deficient number, since it is larger than the sum of its proper divisors (16835312186).

21044140210 is a wasteful number, since it uses less digits than its factorization.

21044140210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104414028.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21044140210 its reverse (1204144012), we get a palindrome (22248284222).

The spelling of 21044140210 in words is "twenty-one billion, forty-four million, one hundred forty thousand, two hundred ten".