21022000111 has 4 divisors (see below), whose sum is σ = 24025142992. Its totient is φ = 18018857232.

The previous prime is 21022000091. The next prime is 21022000123. The reversal of 21022000111 is 11100022012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022000111 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 (21022000141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501571430 + ... + 1501571443.

It is an arithmetic number, because the mean of its divisors is an integer number (6006285748).

Almost surely, 2^21022000111 is an apocalyptic number.

21022000111 is a deficient number, since it is larger than the sum of its proper divisors (3003142881).

21022000111 is an equidigital number, since it uses as much as digits as its factorization.

21022000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003142880.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21022000111 its reverse (11100022012), we get a palindrome (32122022123).

The spelling of 21022000111 in words is "twenty-one billion, twenty-two million, one hundred eleven", and thus it is an aban number.