1211021212211 has 2 divisors, whose sum is σ = 1211021212212. Its totient is φ = 1211021212210.

The previous prime is 1211021212201. The next prime is 1211021212231. The reversal of 1211021212211 is 1122121201121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1122121201121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211021212211 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211021212211.

It is not a weakly prime, because it can be changed into another prime (1211021212201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510606105 + 605510606106.

It is an arithmetic number, because the mean of its divisors is an integer number (605510606106).

Almost surely, 2^{1211021212211} is an apocalyptic number.

1211021212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211021212211 is an equidigital number, since it uses as much as digits as its factorization.

1211021212211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211021212211 its reverse (1122121201121), we get a palindrome (2333142413332).

The spelling of 1211021212211 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twelve thousand, two hundred eleven".