21100111221122 has 16 divisors (see below), whose sum is σ = 31669457984640. Its totient is φ = 10543626540912.

The previous prime is 21100111221121. The next prime is 21100111221143. The reversal of 21100111221122 is 22112211100112.

It is a self number, because there is not a number n which added to its sum of digits gives 21100111221122.

It is not an unprimeable number, because it can be changed into a prime (21100111221121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32266904 + ... + 32914332.

It is an arithmetic number, because the mean of its divisors is an integer number (1979341124040).

Almost surely, 2^{21100111221122} is an apocalyptic number.

21100111221122 is a deficient number, since it is larger than the sum of its proper divisors (10569346763518).

21100111221122 is a wasteful number, since it uses less digits than its factorization.

21100111221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657337.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21100111221122 its reverse (22112211100112), we get a palindrome (43212322321234).

The spelling of 21100111221122 in words is "twenty-one trillion, one hundred billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-two".