21211230111 has 8 divisors (see below), whose sum is σ = 28405141680. Its totient is φ = 14079069312.

The previous prime is 21211230107. The next prime is 21211230133. The reversal of 21211230111 is 11103211212.

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

It is not a de Polignac number, because 21211230111 - 2² = 21211230107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211230211) 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, 15436890 + ... + 15438263.

It is an arithmetic number, because the mean of its divisors is an integer number (3550642710).

Almost surely, 2^21211230111 is an apocalyptic number.

21211230111 is a deficient number, since it is larger than the sum of its proper divisors (7193911569).

21211230111 is a wasteful number, since it uses less digits than its factorization.

21211230111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30875385.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21211230111 its reverse (11103211212), we get a palindrome (32314441323).

The spelling of 21211230111 in words is "twenty-one billion, two hundred eleven million, two hundred thirty thousand, one hundred eleven".