2021222112121 has 2 divisors, whose sum is σ = 2021222112122. Its totient is φ = 2021222112120.

The previous prime is 2021222112113. The next prime is 2021222112197. The reversal of 2021222112121 is 1212112221202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1787004830521 + 234217281600 = 1336789^2 + 483960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021222112121 - 2³ = 2021222112113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021222112101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010611056060 + 1010611056061.

It is an arithmetic number, because the mean of its divisors is an integer number (1010611056061).

Almost surely, 2^{2021222112121} is an apocalyptic number.

It is an amenable number.

2021222112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021222112121 is an equidigital number, since it uses as much as digits as its factorization.

2021222112121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2021222112121 its reverse (1212112221202), we get a palindrome (3233334333323).

The spelling of 2021222112121 in words is "two trillion, twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".