21113120211 has 8 divisors (see below), whose sum is σ = 28221737424. Its totient is φ = 14039958240.

The previous prime is 21113120209. The next prime is 21113120219. The reversal of 21113120211 is 11202131112.

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

It is not a de Polignac number, because 21113120211 - 2¹ = 21113120209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113120219) 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, 8862420 + ... + 8864801.

It is an arithmetic number, because the mean of its divisors is an integer number (3527717178).

Almost surely, 2^21113120211 is an apocalyptic number.

21113120211 is a deficient number, since it is larger than the sum of its proper divisors (7108617213).

21113120211 is a wasteful number, since it uses less digits than its factorization.

21113120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17727621.

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

Adding to 21113120211 its reverse (11202131112), we get a palindrome (32315251323).

The spelling of 21113120211 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, two hundred eleven".