21304111277 has 2 divisors, whose sum is σ = 21304111278. Its totient is φ = 21304111276.

The previous prime is 21304111259. The next prime is 21304111313. The reversal of 21304111277 is 77211140312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18737776996 + 2566334281 = 136886^2 + 50659^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304111277 - 2⁸ = 21304111021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21304191277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652055638 + 10652055639.

It is an arithmetic number, because the mean of its divisors is an integer number (10652055639).

Almost surely, 2^21304111277 is an apocalyptic number.

It is an amenable number.

21304111277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304111277 is an equidigital number, since it uses as much as digits as its factorization.

21304111277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

Adding to 21304111277 its reverse (77211140312), we get a palindrome (98515251589).

The spelling of 21304111277 in words is "twenty-one billion, three hundred four million, one hundred eleven thousand, two hundred seventy-seven".