21243044311 has 8 divisors (see below), whose sum is σ = 21628925424. Its totient is φ = 20859727680.

The previous prime is 21243044309. The next prime is 21243044351. The reversal of 21243044311 is 11344034212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21243044311 - 2¹ = 21243044309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243044351) 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 7 ways as a sum of consecutive naturals, for example, 624400 + ... + 657541.

It is an arithmetic number, because the mean of its divisors is an integer number (2703615678).

Almost surely, 2^21243044311 is an apocalyptic number.

21243044311 is a deficient number, since it is larger than the sum of its proper divisors (385881113).

21243044311 is a wasteful number, since it uses less digits than its factorization.

21243044311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282241.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21243044311 its reverse (11344034212), we get a palindrome (32587078523).

The spelling of 21243044311 in words is "twenty-one billion, two hundred forty-three million, forty-four thousand, three hundred eleven".