2221110121121 has 4 divisors (see below), whose sum is σ = 2272763844912. Its totient is φ = 2169456397332.

The previous prime is 2221110121079. The next prime is 2221110121123. The reversal of 2221110121121 is 1211210111222.

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 2221110121121 - 2¹⁴ = 2221110104737 is a prime.

It is a super-2 number, since 2×2221110121121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221110121121.

It is not an unprimeable number, because it can be changed into a prime (2221110121123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25826861831 + ... + 25826861916.

It is an arithmetic number, because the mean of its divisors is an integer number (568190961228).

Almost surely, 2^{2221110121121} is an apocalyptic number.

It is an amenable number.

2221110121121 is a deficient number, since it is larger than the sum of its proper divisors (51653723791).

2221110121121 is an equidigital number, since it uses as much as digits as its factorization.

2221110121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51653723790.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2221110121121 its reverse (1211210111222), we get a palindrome (3432320232343).

The spelling of 2221110121121 in words is "two trillion, two hundred twenty-one billion, one hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".