2221110121 has 4 divisors (see below), whose sum is σ = 2222848000. Its totient is φ = 2219372244.

The previous prime is 2221110119. The next prime is 2221110131. The reversal of 2221110121 is 1210111222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1210111222 = 2 ⋅605055611.

It is a cyclic number.

It is not a de Polignac number, because 2221110121 - 2¹ = 2221110119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221110131) 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, 867021 + ... + 869578.

It is an arithmetic number, because the mean of its divisors is an integer number (555712000).

Almost surely, 2^2221110121 is an apocalyptic number.

It is an amenable number.

2221110121 is a deficient number, since it is larger than the sum of its proper divisors (1737879).

2221110121 is a wasteful number, since it uses less digits than its factorization.

2221110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737878.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2221110121 is about 47128.6549882341. The cubic root of 2221110121 is about 1304.7381576117.

Adding to 2221110121 its reverse (1210111222), we get a palindrome (3431221343).

The spelling of 2221110121 in words is "two billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty-one".