21411022111 has 4 divisors (see below), whose sum is σ = 21418365112. Its totient is φ = 21403679112.

The previous prime is 21411022099. The next prime is 21411022117. The reversal of 21411022111 is 11122011412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21411022111 - 2¹¹ = 21411020063 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 (21411022117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3667125 + ... + 3672958.

It is an arithmetic number, because the mean of its divisors is an integer number (5354591278).

Almost surely, 2^21411022111 is an apocalyptic number.

21411022111 is a deficient number, since it is larger than the sum of its proper divisors (7343001).

21411022111 is an equidigital number, since it uses as much as digits as its factorization.

21411022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7343000.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21411022111 its reverse (11122011412), we get a palindrome (32533033523).

The spelling of 21411022111 in words is "twenty-one billion, four hundred eleven million, twenty-two thousand, one hundred eleven".