21652380073 has 2 divisors, whose sum is σ = 21652380074. Its totient is φ = 21652380072.

The previous prime is 21652380059. The next prime is 21652380083. The reversal of 21652380073 is 37008325612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21184220304 + 468159769 = 145548^2 + 21637^2 .

It is a cyclic number.

It is not a de Polignac number, because 21652380073 - 2³³ = 13062445481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21652380023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826190036 + 10826190037.

It is an arithmetic number, because the mean of its divisors is an integer number (10826190037).

Almost surely, 2^21652380073 is an apocalyptic number.

It is an amenable number.

21652380073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652380073 is an equidigital number, since it uses as much as digits as its factorization.

21652380073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 21652380073 in words is "twenty-one billion, six hundred fifty-two million, three hundred eighty thousand, seventy-three".