21443543232145 has 8 divisors (see below), whose sum is σ = 26851045438656. Its totient is φ = 16408972212336.

The previous prime is 21443543232079. The next prime is 21443543232157. The reversal of 21443543232145 is 54123234534412.

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

It is a cyclic number.

It is not a de Polignac number, because 21443543232145 - 2¹¹ = 21443543230097 is a prime.

It is a super-2 number, since 2×21443543232145² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93232796547 + ... + 93232796776.

It is an arithmetic number, because the mean of its divisors is an integer number (3356380679832).

Almost surely, 2^{21443543232145} is an apocalyptic number.

It is an amenable number.

21443543232145 is a deficient number, since it is larger than the sum of its proper divisors (5407502206511).

21443543232145 is a wasteful number, since it uses less digits than its factorization.

21443543232145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186465593351.

The product of its digits is 1382400, while the sum is 43.

Adding to 21443543232145 its reverse (54123234534412), we get a palindrome (75566777766557).

The spelling of 21443543232145 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-three million, two hundred thirty-two thousand, one hundred forty-five".