212101011121211 has 4 divisors (see below), whose sum is σ = 212102771255424. Its totient is φ = 212099250987000.

The previous prime is 212101011121177. The next prime is 212101011121249. The reversal of 212101011121211 is 112121110101212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212101011121211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212101011121211.

It is not an unprimeable number, because it can be changed into a prime (212101011121291) 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, 879886340 + ... + 880127361.

It is an arithmetic number, because the mean of its divisors is an integer number (53025692813856).

Almost surely, 2^{212101011121211} is an apocalyptic number.

212101011121211 is a deficient number, since it is larger than the sum of its proper divisors (1760134213).

212101011121211 is a wasteful number, since it uses less digits than its factorization.

212101011121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760134212.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212101011121211 its reverse (112121110101212), we get a palindrome (324222121222423).

The spelling of 212101011121211 in words is "two hundred twelve trillion, one hundred one billion, eleven million, one hundred twenty-one thousand, two hundred eleven".