2211200111221 has 4 divisors (see below), whose sum is σ = 2212996375744. Its totient is φ = 2209403846700.

The previous prime is 2211200111167. The next prime is 2211200111261. The reversal of 2211200111221 is 1221110021122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2211200111221 - 2¹⁵ = 2211200078453 is a prime.

It is a super-2 number, since 2×2211200111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211200111195 and 2211200111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211200111261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898130415 + ... + 898132876.

It is an arithmetic number, because the mean of its divisors is an integer number (553249093936).

Almost surely, 2^{2211200111221} is an apocalyptic number.

It is an amenable number.

2211200111221 is a deficient number, since it is larger than the sum of its proper divisors (1796264523).

2211200111221 is a wasteful number, since it uses less digits than its factorization.

2211200111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796264522.

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

Adding to 2211200111221 its reverse (1221110021122), we get a palindrome (3432310132343).

Subtracting from 2211200111221 its reverse (1221110021122), we obtain a palindrome (990090090099).

The spelling of 2211200111221 in words is "two trillion, two hundred eleven billion, two hundred million, one hundred eleven thousand, two hundred twenty-one".