21144443210 has 32 divisors (see below), whose sum is σ = 41669949312. Its totient is φ = 7661119680.

The previous prime is 21144443147. The next prime is 21144443231. The reversal of 21144443210 is 1234444112.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21144443210.

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 15 ways as a sum of consecutive naturals, for example, 316502 + ... + 377441.

It is an arithmetic number, because the mean of its divisors is an integer number (1302185916).

Almost surely, 2^21144443210 is an apocalyptic number.

21144443210 is a deficient number, since it is larger than the sum of its proper divisors (20525506102).

21144443210 is a wasteful number, since it uses less digits than its factorization.

21144443210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694238.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21144443210 its reverse (1234444112), we get a palindrome (22378887322).

The spelling of 21144443210 in words is "twenty-one billion, one hundred forty-four million, four hundred forty-three thousand, two hundred ten".