21122222120111 has 32 divisors (see below), whose sum is σ = 25039357894656. Its totient is φ = 17442262656000.

The previous prime is 21122222120099. The next prime is 21122222120137. The reversal of 21122222120111 is 11102122222112.

It is not a de Polignac number, because 21122222120111 - 2⁶ = 21122222120047 is a prime.

It is a super-2 number, since 2×21122222120111² (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 (21122222120911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7587146 + ... + 9990456.

It is an arithmetic number, because the mean of its divisors is an integer number (782479934208).

Almost surely, 2^{21122222120111} is an apocalyptic number.

21122222120111 is a deficient number, since it is larger than the sum of its proper divisors (3917135774545).

21122222120111 is a wasteful number, since it uses less digits than its factorization.

21122222120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403743.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21122222120111 its reverse (11102122222112), we get a palindrome (32224344342223).

The spelling of 21122222120111 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred twenty thousand, one hundred eleven".