21443541133345 has 8 divisors (see below), whose sum is σ = 25734477522600. Its totient is φ = 17153347464960.

The previous prime is 21443541133277. The next prime is 21443541133351. The reversal of 21443541133345 is 54333114534412.

It can be written as a sum of positive squares in 4 ways, for example, as 1391666136721 + 20051874996624 = 1179689^2 + 4477932^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-21443541133345 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185616696 + ... + 185732185.

It is an arithmetic number, because the mean of its divisors is an integer number (3216809690325).

Almost surely, 2^{21443541133345} is an apocalyptic number.

It is an amenable number.

21443541133345 is a deficient number, since it is larger than the sum of its proper divisors (4290936389255).

21443541133345 is a wasteful number, since it uses less digits than its factorization.

21443541133345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371360435.

The product of its digits is 1036800, while the sum is 43.

Adding to 21443541133345 its reverse (54333114534412), we get a palindrome (75776655667757).

The spelling of 21443541133345 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-one million, one hundred thirty-three thousand, three hundred forty-five".