21311230111 has 8 divisors (see below), whose sum is σ = 21487592448. Its totient is φ = 21135543000.

The previous prime is 21311230103. The next prime is 21311230139. The reversal of 21311230111 is 11103211312.

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 21311230111 - 2³ = 21311230103 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 (21311230211) 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, 105325 + ... + 231766.

It is an arithmetic number, because the mean of its divisors is an integer number (2685949056).

Almost surely, 2^21311230111 is an apocalyptic number.

21311230111 is a deficient number, since it is larger than the sum of its proper divisors (176362337).

21311230111 is a wasteful number, since it uses less digits than its factorization.

21311230111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337613.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21311230111 its reverse (11103211312), we get a palindrome (32414441423).

The spelling of 21311230111 in words is "twenty-one billion, three hundred eleven million, two hundred thirty thousand, one hundred eleven".