21443370650027 has 2 divisors, whose sum is σ = 21443370650028. Its totient is φ = 21443370650026.

The previous prime is 21443370650017. The next prime is 21443370650047. The reversal of 21443370650027 is 72005607334412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21443370650027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21443370650027.

It is not a weakly prime, because it can be changed into another prime (21443370650017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721685325013 + 10721685325014.

It is an arithmetic number, because the mean of its divisors is an integer number (10721685325014).

Almost surely, 2^{21443370650027} is an apocalyptic number.

21443370650027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443370650027 is an equidigital number, since it uses as much as digits as its factorization.

21443370650027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 44.

Adding to 21443370650027 its reverse (72005607334412), we get a palindrome (93448977984439).

The spelling of 21443370650027 in words is "twenty-one trillion, four hundred forty-three billion, three hundred seventy million, six hundred fifty thousand, twenty-seven".