21443543105210 has 16 divisors (see below), whose sum is σ = 38655730317096. Its totient is φ = 8564672191488.

The previous prime is 21443543105191. The next prime is 21443543105213. The reversal of 21443543105210 is 1250134534412.

It can be written as a sum of positive squares in 4 ways, for example, as 16844186763889 + 4599356341321 = 4104167^2 + 2144611^2 .

It is not an unprimeable number, because it can be changed into a prime (21443543105213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1593124259 + ... + 1593137718.

Almost surely, 2^{21443543105210} is an apocalyptic number.

21443543105210 is a deficient number, since it is larger than the sum of its proper divisors (17212187211886).

21443543105210 is a wasteful number, since it uses less digits than its factorization.

21443543105210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186262657.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21443543105210 its reverse (1250134534412), we get a palindrome (22693677639622).

The spelling of 21443543105210 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-three million, one hundred five thousand, two hundred ten".