21043320211 has 8 divisors (see below), whose sum is σ = 22865408000. Its totient is φ = 19292686920.

The previous prime is 21043320203. The next prime is 21043320223. The reversal of 21043320211 is 11202334012.

It is a happy number.

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 21043320211 - 2³ = 21043320203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043320611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17863011 + ... + 17864188.

It is an arithmetic number, because the mean of its divisors is an integer number (2858176000).

Almost surely, 2^21043320211 is an apocalyptic number.

21043320211 is a deficient number, since it is larger than the sum of its proper divisors (1822087789).

21043320211 is a wasteful number, since it uses less digits than its factorization.

21043320211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35727249.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21043320211 its reverse (11202334012), we get a palindrome (32245654223).

The spelling of 21043320211 in words is "twenty-one billion, forty-three million, three hundred twenty thousand, two hundred eleven".