2221111212111 has 24 divisors (see below), whose sum is σ = 3500005676544. Its totient is φ = 1346099985360.

The previous prime is 2221111212091. The next prime is 2221111212167. The reversal of 2221111212111 is 1112121111222.

It is a happy number.

2221111212111 is a `hidden beast` number, since 222 + 111 + 121 + 211 + 1 = 666.

It is not a de Polignac number, because 2221111212111 - 2¹⁴ = 2221111195727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221111212181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5176000 + ... + 5588666.

It is an arithmetic number, because the mean of its divisors is an integer number (145833569856).

Almost surely, 2^{2221111212111} is an apocalyptic number.

2221111212111 is a deficient number, since it is larger than the sum of its proper divisors (1278894464433).

2221111212111 is a wasteful number, since it uses less digits than its factorization.

2221111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467051 (or 467048 counting only the distinct ones).

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

Adding to 2221111212111 its reverse (1112121111222), we get a palindrome (3333232323333).

The spelling of 2221111212111 in words is "two trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".