2211221022121 has 16 divisors (see below), whose sum is σ = 2286127742976. Its totient is φ = 2136539250000.

The previous prime is 2211221022119. The next prime is 2211221022163. The reversal of 2211221022121 is 1212201221122.

It is a cyclic number.

It is not a de Polignac number, because 2211221022121 - 2¹ = 2211221022119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2211221022221) 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, 132949476 + ... + 132966106.

It is an arithmetic number, because the mean of its divisors is an integer number (142882983936).

Almost surely, 2^{2211221022121} is an apocalyptic number.

It is an amenable number.

2211221022121 is a deficient number, since it is larger than the sum of its proper divisors (74906720855).

2211221022121 is a wasteful number, since it uses less digits than its factorization.

2211221022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23124.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2211221022121 its reverse (1212201221122), we get a palindrome (3423422243243).

The spelling of 2211221022121 in words is "two trillion, two hundred eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-one".