21302000077 has 2 divisors, whose sum is σ = 21302000078. Its totient is φ = 21302000076.

The previous prime is 21302000029. The next prime is 21302000113. The reversal of 21302000077 is 77000020312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21276889956 + 25110121 = 145866^2 + 5011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302000077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302000677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651000038 + 10651000039.

It is an arithmetic number, because the mean of its divisors is an integer number (10651000039).

Almost surely, 2^21302000077 is an apocalyptic number.

It is an amenable number.

21302000077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302000077 is an equidigital number, since it uses as much as digits as its factorization.

21302000077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 22.

Adding to 21302000077 its reverse (77000020312), we get a palindrome (98302020389).

The spelling of 21302000077 in words is "twenty-one billion, three hundred two million, seventy-seven", and thus it is an aban number.