2221021102121 has 12 divisors (see below), whose sum is σ = 2250529195380. Its totient is φ = 2191893534720.

The previous prime is 2221021102117. The next prime is 2221021102129. The reversal of 2221021102121 is 1212011201222.

It can be written as a sum of positive squares in 2 ways, for example, as 207786458896 + 2013234643225 = 455836^2 + 1418885^2 .

It is not a de Polignac number, because 2221021102121 - 2² = 2221021102117 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 2221021102121.

It is not an unprimeable number, because it can be changed into a prime (2221021102129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6226361 + ... + 6573401.

It is an arithmetic number, because the mean of its divisors is an integer number (187544099615).

Almost surely, 2^{2221021102121} is an apocalyptic number.

It is an amenable number.

2221021102121 is a deficient number, since it is larger than the sum of its proper divisors (29508093259).

2221021102121 is an frugal number, since it uses more digits than its factorization.

2221021102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348136 (or 348053 counting only the distinct ones).

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

Adding to 2221021102121 its reverse (1212011201222), we get a palindrome (3433032303343).

The spelling of 2221021102121 in words is "two trillion, two hundred twenty-one billion, twenty-one million, one hundred two thousand, one hundred twenty-one".