21202400012243 has 2 divisors, whose sum is σ = 21202400012244. Its totient is φ = 21202400012242.

The previous prime is 21202400012201. The next prime is 21202400012249. The reversal of 21202400012243 is 34221000420212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202400012243 - 2⁸ = 21202400011987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202400012249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601200006121 + 10601200006122.

It is an arithmetic number, because the mean of its divisors is an integer number (10601200006122).

Almost surely, 2^{21202400012243} is an apocalyptic number.

21202400012243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202400012243 is an equidigital number, since it uses as much as digits as its factorization.

21202400012243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21202400012243 its reverse (34221000420212), we get a palindrome (55423400432455).

The spelling of 21202400012243 in words is "twenty-one trillion, two hundred two billion, four hundred million, twelve thousand, two hundred forty-three".