212121200011901 has 2 divisors, whose sum is σ = 212121200011902. Its totient is φ = 212121200011900.

The previous prime is 212121200011879. The next prime is 212121200011939. The reversal of 212121200011901 is 109110002121212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143922490432900 + 68198709579001 = 11996770^2 + 8258251^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121200011901 - 2¹⁴ = 212121199995517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212121200014901) 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, 106060600005950 + 106060600005951.

It is an arithmetic number, because the mean of its divisors is an integer number (106060600005951).

Almost surely, 2^{212121200011901} is an apocalyptic number.

It is an amenable number.

212121200011901 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121200011901 is an equidigital number, since it uses as much as digits as its factorization.

212121200011901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 212121200011901 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred million, eleven thousand, nine hundred one".