21101022111 has 24 divisors (see below), whose sum is σ = 30767093136. Its totient is φ = 12856646400.

The previous prime is 21101022077. The next prime is 21101022161. The reversal of 21101022111 is 11122010112.

It is not a de Polignac number, because 21101022111 - 2¹¹ = 21101020063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101022161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154830 + ... + 257243.

It is an arithmetic number, because the mean of its divisors is an integer number (1281962214).

Almost surely, 2^21101022111 is an apocalyptic number.

21101022111 is a deficient number, since it is larger than the sum of its proper divisors (9666071025).

21101022111 is a wasteful number, since it uses less digits than its factorization.

21101022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412203 (or 412190 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101022111 its reverse (11122010112), we get a palindrome (32223032223).

The spelling of 21101022111 in words is "twenty-one billion, one hundred one million, twenty-two thousand, one hundred eleven".