21101300243 has 2 divisors, whose sum is σ = 21101300244. Its totient is φ = 21101300242.

The previous prime is 21101300179. The next prime is 21101300249. The reversal of 21101300243 is 34200310112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101300243 - 2⁶ = 21101300179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21101300249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550650121 + 10550650122.

It is an arithmetic number, because the mean of its divisors is an integer number (10550650122).

Almost surely, 2^21101300243 is an apocalyptic number.

21101300243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101300243 is an equidigital number, since it uses as much as digits as its factorization.

21101300243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21101300243 its reverse (34200310112), we get a palindrome (55301610355).

The spelling of 21101300243 in words is "twenty-one billion, one hundred one million, three hundred thousand, two hundred forty-three".