21130030247 has 2 divisors, whose sum is σ = 21130030248. Its totient is φ = 21130030246.

The previous prime is 21130030213. The next prime is 21130030267. The reversal of 21130030247 is 74203003112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130030247 - 2⁶ = 21130030183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130030267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565015123 + 10565015124.

It is an arithmetic number, because the mean of its divisors is an integer number (10565015124).

Almost surely, 2^21130030247 is an apocalyptic number.

21130030247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130030247 is an equidigital number, since it uses as much as digits as its factorization.

21130030247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 21130030247 its reverse (74203003112), we get a palindrome (95333033359).

The spelling of 21130030247 in words is "twenty-one billion, one hundred thirty million, thirty thousand, two hundred forty-seven".