2221001122121 has 16 divisors (see below), whose sum is σ = 2274820860480. Its totient is φ = 2167759177920.

The previous prime is 2221001122111. The next prime is 2221001122129. The reversal of 2221001122121 is 1212211001222.

It is a cyclic number.

It is not a de Polignac number, because 2221001122121 - 2³⁴ = 2203821252937 is a prime.

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 2221001122121.

It is not an unprimeable number, because it can be changed into a prime (2221001122129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16662686 + ... + 16795448.

It is an arithmetic number, because the mean of its divisors is an integer number (142176303780).

Almost surely, 2^{2221001122121} is an apocalyptic number.

It is an amenable number.

2221001122121 is a deficient number, since it is larger than the sum of its proper divisors (53819738359).

2221001122121 is a wasteful number, since it uses less digits than its factorization.

2221001122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134936.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2221001122121 its reverse (1212211001222), we get a palindrome (3433212123343).

The spelling of 2221001122121 in words is "two trillion, two hundred twenty-one billion, one million, one hundred twenty-two thousand, one hundred twenty-one".