1721328787141 has 2 divisors, whose sum is σ = 1721328787142. Its totient is φ = 1721328787140.

The previous prime is 1721328787111. The next prime is 1721328787147. The reversal of 1721328787141 is 1417878231271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1398415042116 + 322913745025 = 1182546^2 + 568255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721328787141 - 2⁹ = 1721328786629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721328787147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860664393570 + 860664393571.

It is an arithmetic number, because the mean of its divisors is an integer number (860664393571).

Almost surely, 2^{1721328787141} is an apocalyptic number.

It is an amenable number.

1721328787141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721328787141 is an equidigital number, since it uses as much as digits as its factorization.

1721328787141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 52.

The spelling of 1721328787141 in words is "one trillion, seven hundred twenty-one billion, three hundred twenty-eight million, seven hundred eighty-seven thousand, one hundred forty-one".