21111121201122 has 24 divisors (see below), whose sum is σ = 45760921687260. Its totient is φ = 7033939002720.

The previous prime is 21111121201099. The next prime is 21111121201127. The reversal of 21111121201122 is 22110212111112.

It is a happy number.

21111121201122 is a `hidden beast` number, since 211 + 11 + 121 + 201 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15190420505121 + 5920700696001 = 3897489^2 + 2433249^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21111121201095 and 21111121201104.

It is not an unprimeable number, because it can be changed into a prime (21111121201127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258407829 + ... + 258489512.

Almost surely, 2^{21111121201122} is an apocalyptic number.

21111121201122 is an abundant number, since it is smaller than the sum of its proper divisors (24649800486138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111121201122 is a wasteful number, since it uses less digits than its factorization.

21111121201122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516899618 (or 516899615 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21111121201122 its reverse (22110212111112), we get a palindrome (43221333312234).

The spelling of 21111121201122 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-two".