21112220100112 has 20 divisors (see below), whose sum is σ = 40971655543660. Its totient is φ = 10538889637248.

The previous prime is 21112220100089. The next prime is 21112220100113. The reversal of 21112220100112 is 21100102221112.

It can be written as a sum of positive squares in 2 ways, for example, as 7458929058816 + 13653291041296 = 2731104^2 + 3695036^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21112220100113) 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, 1076265687 + ... + 1076285302.

It is an arithmetic number, because the mean of its divisors is an integer number (2048582777183).

Almost surely, 2^{21112220100112} is an apocalyptic number.

It is an amenable number.

21112220100112 is a deficient number, since it is larger than the sum of its proper divisors (19859435443548).

21112220100112 is a wasteful number, since it uses less digits than its factorization.

21112220100112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152551610 (or 2152551604 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21112220100112 its reverse (21100102221112), we get a palindrome (42212322321224).

The spelling of 21112220100112 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, one hundred thousand, one hundred twelve".