212222120021 has 2 divisors, whose sum is σ = 212222120022. Its totient is φ = 212222120020.

The previous prime is 212222119999. The next prime is 212222120027. The reversal of 212222120021 is 120021222212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136984372996 + 75237747025 = 370114^2 + 274295^2 .

It is a cyclic number.

It is not a de Polignac number, because 212222120021 - 2⁶ = 212222119957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212222120027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106111060010 + 106111060011.

It is an arithmetic number, because the mean of its divisors is an integer number (106111060011).

Almost surely, 2^212222120021 is an apocalyptic number.

It is an amenable number.

212222120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212222120021 is an equidigital number, since it uses as much as digits as its factorization.

212222120021 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 17.

Adding to 212222120021 its reverse (120021222212), we get a palindrome (332243342233).

The spelling of 212222120021 in words is "two hundred twelve billion, two hundred twenty-two million, one hundred twenty thousand, twenty-one".