21443055530531 has 16 divisors (see below), whose sum is σ = 22387370955264. Its totient is φ = 20499743926464.

The previous prime is 21443055530527. The next prime is 21443055530657. The reversal of 21443055530531 is 13503555034412.

It is a cyclic number.

It is not a de Polignac number, because 21443055530531 - 2² = 21443055530527 is a prime.

It is a super-2 number, since 2×21443055530531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443055533531) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 342055916 + ... + 342118598.

It is an arithmetic number, because the mean of its divisors is an integer number (1399210684704).

Almost surely, 2^{21443055530531} is an apocalyptic number.

21443055530531 is a deficient number, since it is larger than the sum of its proper divisors (944315424733).

21443055530531 is a wasteful number, since it uses less digits than its factorization.

21443055530531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70450.

The product of its (nonzero) digits is 540000, while the sum is 41.

The spelling of 21443055530531 in words is "twenty-one trillion, four hundred forty-three billion, fifty-five million, five hundred thirty thousand, five hundred thirty-one".