1722642343021 has 2 divisors, whose sum is σ = 1722642343022. Its totient is φ = 1722642343020.

The previous prime is 1722642343007. The next prime is 1722642343067. The reversal of 1722642343021 is 1203432462271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1621575574921 + 101066768100 = 1273411^2 + 317910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722642343021 - 2¹⁷ = 1722642211949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722642323021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861321171510 + 861321171511.

It is an arithmetic number, because the mean of its divisors is an integer number (861321171511).

Almost surely, 2^{1722642343021} is an apocalyptic number.

It is an amenable number.

1722642343021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722642343021 is an equidigital number, since it uses as much as digits as its factorization.

1722642343021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 1722642343021 in words is "one trillion, seven hundred twenty-two billion, six hundred forty-two million, three hundred forty-three thousand, twenty-one".