21130302049 has 2 divisors, whose sum is σ = 21130302050. Its totient is φ = 21130302048.

The previous prime is 21130302047. The next prime is 21130302091. The reversal of 21130302049 is 94020303112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20957773824 + 172528225 = 144768^2 + 13135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130302049 - 2¹ = 21130302047 is a prime.

Together with 21130302047, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21130302043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565151024 + 10565151025.

It is an arithmetic number, because the mean of its divisors is an integer number (10565151025).

Almost surely, 2^21130302049 is an apocalyptic number.

It is an amenable number.

21130302049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130302049 is an equidigital number, since it uses as much as digits as its factorization.

21130302049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21130302049 in words is "twenty-one billion, one hundred thirty million, three hundred two thousand, forty-nine".