21256080301 has 2 divisors, whose sum is σ = 21256080302. Its totient is φ = 21256080300.

The previous prime is 21256080281. The next prime is 21256080317. The reversal of 21256080301 is 10308065212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16887002500 + 4369077801 = 129950^2 + 66099^2 .

It is a cyclic number.

It is not a de Polignac number, because 21256080301 - 2¹⁹ = 21255556013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21256080301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21256080331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10628040150 + 10628040151.

It is an arithmetic number, because the mean of its divisors is an integer number (10628040151).

Almost surely, 2^21256080301 is an apocalyptic number.

It is an amenable number.

21256080301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21256080301 is an equidigital number, since it uses as much as digits as its factorization.

21256080301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 21256080301 in words is "twenty-one billion, two hundred fifty-six million, eighty thousand, three hundred one".