21112222112201 has 24 divisors (see below), whose sum is σ = 23438259884424. Its totient is φ = 19000872000000.

The previous prime is 21112222112183. The next prime is 21112222112227. The reversal of 21112222112201 is 10221122221112.

It can be written as a sum of positive squares in 4 ways, for example, as 13247590796176 + 7864631316025 = 3639724^2 + 2804395^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21112222112201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112222112801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120912881 + ... + 121087361.

It is an arithmetic number, because the mean of its divisors is an integer number (976594161851).

Almost surely, 2^{21112222112201} is an apocalyptic number.

It is an amenable number.

21112222112201 is a deficient number, since it is larger than the sum of its proper divisors (2326037772223).

21112222112201 is a wasteful number, since it uses less digits than its factorization.

21112222112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184505 (or 184494 counting only the distinct ones).

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

Adding to 21112222112201 its reverse (10221122221112), we get a palindrome (31333344333313).

The spelling of 21112222112201 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, one hundred twelve thousand, two hundred one".