2221212102121 has 4 divisors (see below), whose sum is σ = 2221264609492. Its totient is φ = 2221159594752.

The previous prime is 2221212102097. The next prime is 2221212102169. The reversal of 2221212102121 is 1212012121222.

2221212102121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 997841166400 + 1223370935721 = 998920^2 + 1106061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221212102121 - 2⁴¹ = 22188846569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221212108121) 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, 26190180 + ... + 26274853.

It is an arithmetic number, because the mean of its divisors is an integer number (555316152373).

Almost surely, 2^{2221212102121} is an apocalyptic number.

It is an amenable number.

2221212102121 is a deficient number, since it is larger than the sum of its proper divisors (52507371).

2221212102121 is an equidigital number, since it uses as much as digits as its factorization.

2221212102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52507370.

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

Adding to 2221212102121 its reverse (1212012121222), we get a palindrome (3433224223343).

The spelling of 2221212102121 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred twenty-one".