21313230077 has 2 divisors, whose sum is σ = 21313230078. Its totient is φ = 21313230076.

The previous prime is 21313230067. The next prime is 21313230079. The reversal of 21313230077 is 77003231312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20982681316 + 330548761 = 144854^2 + 18181^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313230077 - 2²⁶ = 21246121213 is a prime.

Together with 21313230079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313230079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656615038 + 10656615039.

It is an arithmetic number, because the mean of its divisors is an integer number (10656615039).

Almost surely, 2^21313230077 is an apocalyptic number.

It is an amenable number.

21313230077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313230077 is an equidigital number, since it uses as much as digits as its factorization.

21313230077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 29.

Adding to 21313230077 its reverse (77003231312), we get a palindrome (98316461389).

The spelling of 21313230077 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty thousand, seventy-seven".