212102020111921 has 2 divisors, whose sum is σ = 212102020111922. Its totient is φ = 212102020111920.

The previous prime is 212102020111853. The next prime is 212102020112051. The reversal of 212102020111921 is 129111020201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149373861859600 + 62728158252321 = 12221860^2 + 7920111^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102020111921 - 2²³ = 212102011723313 is a prime.

It is not a weakly prime, because it can be changed into another prime (212102020111621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051010055960 + 106051010055961.

It is an arithmetic number, because the mean of its divisors is an integer number (106051010055961).

Almost surely, 2^{212102020111921} is an apocalyptic number.

It is an amenable number.

212102020111921 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102020111921 is an equidigital number, since it uses as much as digits as its factorization.

212102020111921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 212102020111921 in words is "two hundred twelve trillion, one hundred two billion, twenty million, one hundred eleven thousand, nine hundred twenty-one".