21242243411 has 4 divisors (see below), whose sum is σ = 21265561824. Its totient is φ = 21218925000.

The previous prime is 21242243383. The next prime is 21242243413. The reversal of 21242243411 is 11434224212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21242243411 is a prime.

It is a super-4 number, since 4×21242243411⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21242243413) 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, 11657840 + ... + 11659661.

It is an arithmetic number, because the mean of its divisors is an integer number (5316390456).

Almost surely, 2^21242243411 is an apocalyptic number.

21242243411 is a deficient number, since it is larger than the sum of its proper divisors (23318413).

21242243411 is an equidigital number, since it uses as much as digits as its factorization.

21242243411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23318412.

The product of its digits is 3072, while the sum is 26.

Adding to 21242243411 its reverse (11434224212), we get a palindrome (32676467623).

The spelling of 21242243411 in words is "twenty-one billion, two hundred forty-two million, two hundred forty-three thousand, four hundred eleven".