2112100111221 has 16 divisors (see below), whose sum is σ = 3003553281024. Its totient is φ = 1315566001664.

The previous prime is 2112100111183. The next prime is 2112100111223. The reversal of 2112100111221 is 1221110012112.

It is a happy number.

It is not a de Polignac number, because 2112100111221 - 2⁹ = 2112100110709 is a prime.

It is a super-2 number, since 2×2112100111221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2112100111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112100111223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151138005 + ... + 151151978.

It is an arithmetic number, because the mean of its divisors is an integer number (187722080064).

Almost surely, 2^{2112100111221} is an apocalyptic number.

It is an amenable number.

2112100111221 is a deficient number, since it is larger than the sum of its proper divisors (891453169803).

2112100111221 is a wasteful number, since it uses less digits than its factorization.

2112100111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302290140.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2112100111221 its reverse (1221110012112), we get a palindrome (3333210123333).

The spelling of 2112100111221 in words is "two trillion, one hundred twelve billion, one hundred million, one hundred eleven thousand, two hundred twenty-one".