21122020110111 has 16 divisors (see below), whose sum is σ = 29857212428544. Its totient is φ = 13236192261504.

The previous prime is 21122020110049. The next prime is 21122020110133. The reversal of 21122020110111 is 11101102022112.

It is a happy number.

It is not a de Polignac number, because 21122020110111 - 2⁶ = 21122020110047 is a prime.

It is a super-2 number, since 2×21122020110111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122020110151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263083915 + ... + 263164188.

It is an arithmetic number, because the mean of its divisors is an integer number (1866075776784).

Almost surely, 2^{21122020110111} is an apocalyptic number.

21122020110111 is a deficient number, since it is larger than the sum of its proper divisors (8735192318433).

21122020110111 is a wasteful number, since it uses less digits than its factorization.

21122020110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526248910.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21122020110111 its reverse (11101102022112), we get a palindrome (32223122132223).

The spelling of 21122020110111 in words is "twenty-one trillion, one hundred twenty-two billion, twenty million, one hundred ten thousand, one hundred eleven".