21013233020243 has 2 divisors, whose sum is σ = 21013233020244. Its totient is φ = 21013233020242.

The previous prime is 21013233020209. The next prime is 21013233020257. The reversal of 21013233020243 is 34202033231012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013233020243 - 2¹⁸ = 21013232758099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013233020443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506616510121 + 10506616510122.

It is an arithmetic number, because the mean of its divisors is an integer number (10506616510122).

Almost surely, 2^{21013233020243} is an apocalyptic number.

21013233020243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013233020243 is an equidigital number, since it uses as much as digits as its factorization.

21013233020243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21013233020243 its reverse (34202033231012), we get a palindrome (55215266251255).

The spelling of 21013233020243 in words is "twenty-one trillion, thirteen billion, two hundred thirty-three million, twenty thousand, two hundred forty-three".