21443542543211 has 16 divisors (see below), whose sum is σ = 22731315609600. Its totient is φ = 20158709286528.

The previous prime is 21443542543183. The next prime is 21443542543219. The reversal of 21443542543211 is 11234524534412.

It is a cyclic number.

It is not a de Polignac number, because 21443542543211 - 2³⁰ = 21442468801387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443542543219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90298316 + ... + 90535478.

It is an arithmetic number, because the mean of its divisors is an integer number (1420707225600).

Almost surely, 2^{21443542543211} is an apocalyptic number.

21443542543211 is a deficient number, since it is larger than the sum of its proper divisors (1287773066389).

21443542543211 is a wasteful number, since it uses less digits than its factorization.

21443542543211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243338.

The product of its digits is 460800, while the sum is 41.

The spelling of 21443542543211 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-two million, five hundred forty-three thousand, two hundred eleven".