21344242011 has 4 divisors (see below), whose sum is σ = 28458989352. Its totient is φ = 14229494672.

The previous prime is 21344242001. The next prime is 21344242043. The reversal of 21344242011 is 11024244312.

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 21344242011 - 2²⁵ = 21310687579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21344242001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3557373666 + ... + 3557373671.

It is an arithmetic number, because the mean of its divisors is an integer number (7114747338).

Almost surely, 2^21344242011 is an apocalyptic number.

21344242011 is a deficient number, since it is larger than the sum of its proper divisors (7114747341).

21344242011 is an equidigital number, since it uses as much as digits as its factorization.

21344242011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114747340.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21344242011 its reverse (11024244312), we get a palindrome (32368486323).

The spelling of 21344242011 in words is "twenty-one billion, three hundred forty-four million, two hundred forty-two thousand, eleven".