21443511344243 has 2 divisors, whose sum is σ = 21443511344244. Its totient is φ = 21443511344242.

The previous prime is 21443511344191. The next prime is 21443511344249. The reversal of 21443511344243 is 34244311534412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21443511344243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21443511344243.

It is not a weakly prime, because it can be changed into another prime (21443511344249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721755672121 + 10721755672122.

It is an arithmetic number, because the mean of its divisors is an integer number (10721755672122).

Almost surely, 2^{21443511344243} is an apocalyptic number.

21443511344243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443511344243 is an equidigital number, since it uses as much as digits as its factorization.

21443511344243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 41.

Adding to 21443511344243 its reverse (34244311534412), we get a palindrome (55687822878655).

The spelling of 21443511344243 in words is "twenty-one trillion, four hundred forty-three billion, five hundred eleven million, three hundred forty-four thousand, two hundred forty-three".