1723861285021 has 2 divisors, whose sum is σ = 1723861285022. Its totient is φ = 1723861285020.

The previous prime is 1723861285009. The next prime is 1723861285109. The reversal of 1723861285021 is 1205821683271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1653165920025 + 70695364996 = 1285755^2 + 265886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1723861285021 - 2²⁵ = 1723827730589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1723861285001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861930642510 + 861930642511.

It is an arithmetic number, because the mean of its divisors is an integer number (861930642511).

Almost surely, 2^{1723861285021} is an apocalyptic number.

It is an amenable number.

1723861285021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1723861285021 is an equidigital number, since it uses as much as digits as its factorization.

1723861285021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 1723861285021 in words is "one trillion, seven hundred twenty-three billion, eight hundred sixty-one million, two hundred eighty-five thousand, twenty-one".