21341204243 has 4 divisors (see below), whose sum is σ = 21743868528. Its totient is φ = 20938539960.

The previous prime is 21341204239. The next prime is 21341204273. The reversal of 21341204243 is 34240214312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21341204243 - 2² = 21341204239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341204273) 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 in 3 ways as a sum of consecutive naturals, for example, 201332063 + ... + 201332168.

It is an arithmetic number, because the mean of its divisors is an integer number (5435967132).

Almost surely, 2^21341204243 is an apocalyptic number.

21341204243 is a deficient number, since it is larger than the sum of its proper divisors (402664285).

21341204243 is an equidigital number, since it uses as much as digits as its factorization.

21341204243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402664284.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21341204243 its reverse (34240214312), we get a palindrome (55581418555).

The spelling of 21341204243 in words is "twenty-one billion, three hundred forty-one million, two hundred four thousand, two hundred forty-three".