21443634311 has 48 divisors (see below), whose sum is σ = 24925017600. Its totient is φ = 18276960000.

The previous prime is 21443634307. The next prime is 21443634319. The reversal of 21443634311 is 11343634412.

It is not a de Polignac number, because 21443634311 - 2² = 21443634307 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 (21443634319) 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 47 ways as a sum of consecutive naturals, for example, 212313161 + ... + 212313261.

It is an arithmetic number, because the mean of its divisors is an integer number (519271200).

Almost surely, 2^21443634311 is an apocalyptic number.

21443634311 is a deficient number, since it is larger than the sum of its proper divisors (3481383289).

21443634311 is a wasteful number, since it uses less digits than its factorization.

21443634311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 291 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The spelling of 21443634311 in words is "twenty-one billion, four hundred forty-three million, six hundred thirty-four thousand, three hundred eleven".