21300011251 has 2 divisors, whose sum is σ = 21300011252. Its totient is φ = 21300011250.

The previous prime is 21300011233. The next prime is 21300011267. The reversal of 21300011251 is 15211000312.

It is an a-pointer prime, because the next prime (21300011267) can be obtained adding 21300011251 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300011251 - 2¹⁹ = 21299486963 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300011651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650005625 + 10650005626.

It is an arithmetic number, because the mean of its divisors is an integer number (10650005626).

Almost surely, 2^21300011251 is an apocalyptic number.

21300011251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300011251 is an equidigital number, since it uses as much as digits as its factorization.

21300011251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21300011251 its reverse (15211000312), we get a palindrome (36511011563).

The spelling of 21300011251 in words is "twenty-one billion, three hundred million, eleven thousand, two hundred fifty-one".