21443545021011 has 4 divisors (see below), whose sum is σ = 28591393361352. Its totient is φ = 14295696680672.

The previous prime is 21443545021009. The next prime is 21443545021127. The reversal of 21443545021011 is 11012054534412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21443545021011 - 2¹ = 21443545021009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21443545023011) 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, 3573924170166 + ... + 3573924170171.

It is an arithmetic number, because the mean of its divisors is an integer number (7147848340338).

Almost surely, 2^{21443545021011} is an apocalyptic number.

21443545021011 is a deficient number, since it is larger than the sum of its proper divisors (7147848340341).

21443545021011 is an equidigital number, since it uses as much as digits as its factorization.

21443545021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7147848340340.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21443545021011 its reverse (11012054534412), we get a palindrome (32455599555423).

The spelling of 21443545021011 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-five million, twenty-one thousand, eleven".