2111122111221 has 40 divisors (see below), whose sum is σ = 3225191692800. Its totient is φ = 1375840533600.

The previous prime is 2111122111199. The next prime is 2111122111229. The reversal of 2111122111221 is 1221112211112.

It is a happy number.

2111122111221 is a `hidden beast` number, since 211 + 1 + 1 + 221 + 11 + 221 = 666.

It is not a de Polignac number, because 2111122111221 - 2⁶ = 2111122111157 is a prime.

It is a super-2 number, since 2×2111122111221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2111122111194 and 2111122111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111122111229) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 986941 + ... + 2279538.

It is an arithmetic number, because the mean of its divisors is an integer number (80629792320).

Almost surely, 2^{2111122111221} is an apocalyptic number.

It is an amenable number.

2111122111221 is a deficient number, since it is larger than the sum of its proper divisors (1114069581579).

2111122111221 is a wasteful number, since it uses less digits than its factorization.

2111122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266671 (or 3266662 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 2111122111221 its reverse (1221112211112), we get a palindrome (3332234322333).

The spelling of 2111122111221 in words is "two trillion, one hundred eleven billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".