21340360277 has 2 divisors, whose sum is σ = 21340360278. Its totient is φ = 21340360276.

The previous prime is 21340360267. The next prime is 21340360331. The reversal of 21340360277 is 77206304312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16015155601 + 5325204676 = 126551^2 + 72974^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340360277 - 2¹² = 21340356181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340360267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670180138 + 10670180139.

It is an arithmetic number, because the mean of its divisors is an integer number (10670180139).

Almost surely, 2^21340360277 is an apocalyptic number.

It is an amenable number.

21340360277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340360277 is an equidigital number, since it uses as much as digits as its factorization.

21340360277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 35.

Adding to 21340360277 its reverse (77206304312), we get a palindrome (98546664589).

The spelling of 21340360277 in words is "twenty-one billion, three hundred forty million, three hundred sixty thousand, two hundred seventy-seven".