21742743619601 has 2 divisors, whose sum is σ = 21742743619602. Its totient is φ = 21742743619600.

The previous prime is 21742743619579. The next prime is 21742743619633. The reversal of 21742743619601 is 10691634724712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21512342659600 + 230400960001 = 4638140^2 + 480001^2 .

It is a cyclic number.

It is not a de Polignac number, because 21742743619601 - 2¹⁸ = 21742743357457 is a prime.

It is not a weakly prime, because it can be changed into another prime (21742743699601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10871371809800 + 10871371809801.

It is an arithmetic number, because the mean of its divisors is an integer number (10871371809801).

Almost surely, 2^{21742743619601} is an apocalyptic number.

It is an amenable number.

21742743619601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21742743619601 is an equidigital number, since it uses as much as digits as its factorization.

21742743619601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 21742743619601 in words is "twenty-one trillion, seven hundred forty-two billion, seven hundred forty-three million, six hundred nineteen thousand, six hundred one".