21301034243 has 2 divisors, whose sum is σ = 21301034244. Its totient is φ = 21301034242.

The previous prime is 21301034203. The next prime is 21301034291. The reversal of 21301034243 is 34243010312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21301034243 - 2¹⁶ = 21300968707 is a prime.

It is not a weakly prime, because it can be changed into another prime (21301034203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650517121 + 10650517122.

It is an arithmetic number, because the mean of its divisors is an integer number (10650517122).

Almost surely, 2^21301034243 is an apocalyptic number.

21301034243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301034243 is an equidigital number, since it uses as much as digits as its factorization.

21301034243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21301034243 its reverse (34243010312), we get a palindrome (55544044555).

The spelling of 21301034243 in words is "twenty-one billion, three hundred one million, thirty-four thousand, two hundred forty-three".