21230130277 has 2 divisors, whose sum is σ = 21230130278. Its totient is φ = 21230130276.

The previous prime is 21230130217. The next prime is 21230130461. The reversal of 21230130277 is 77203103212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11011144356 + 10218985921 = 104934^2 + 101089^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230130277 - 2¹⁹ = 21229605989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230130217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615065138 + 10615065139.

It is an arithmetic number, because the mean of its divisors is an integer number (10615065139).

Almost surely, 2^21230130277 is an apocalyptic number.

It is an amenable number.

21230130277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230130277 is an equidigital number, since it uses as much as digits as its factorization.

21230130277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 28.

Adding to 21230130277 its reverse (77203103212), we get a palindrome (98433233489).

The spelling of 21230130277 in words is "twenty-one billion, two hundred thirty million, one hundred thirty thousand, two hundred seventy-seven".