21041440140389 has 2 divisors, whose sum is σ = 21041440140390. Its totient is φ = 21041440140388.

The previous prime is 21041440140313. The next prime is 21041440140517. The reversal of 21041440140389 is 98304104414012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18320368852900 + 2721071287489 = 4280230^2 + 1649567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21041440140389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041440140289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520720070194 + 10520720070195.

It is an arithmetic number, because the mean of its divisors is an integer number (10520720070195).

Almost surely, 2^{21041440140389} is an apocalyptic number.

It is an amenable number.

21041440140389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041440140389 is an equidigital number, since it uses as much as digits as its factorization.

21041440140389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 21041440140389 in words is "twenty-one trillion, forty-one billion, four hundred forty million, one hundred forty thousand, three hundred eighty-nine".