1724705137021 has 2 divisors, whose sum is σ = 1724705137022. Its totient is φ = 1724705137020.

The previous prime is 1724705137009. The next prime is 1724705137031. The reversal of 1724705137021 is 1207315074271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1704105711396 + 20599425625 = 1305414^2 + 143525^2 .

It is an emirp because it is prime and its reverse (1207315074271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1724705137021 - 2¹⁵ = 1724705104253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1724705137031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862352568510 + 862352568511.

It is an arithmetic number, because the mean of its divisors is an integer number (862352568511).

Almost surely, 2^{1724705137021} is an apocalyptic number.

It is an amenable number.

1724705137021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1724705137021 is an equidigital number, since it uses as much as digits as its factorization.

1724705137021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 1724705137021 in words is "one trillion, seven hundred twenty-four billion, seven hundred five million, one hundred thirty-seven thousand, twenty-one".