210121120111211 has 2 divisors, whose sum is σ = 210121120111212. Its totient is φ = 210121120111210.

The previous prime is 210121120111171. The next prime is 210121120111267. The reversal of 210121120111211 is 112111021121012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210121120111211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210121120111211.

It is not a weakly prime, because it can be changed into another prime (210121120117211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060560055605 + 105060560055606.

It is an arithmetic number, because the mean of its divisors is an integer number (105060560055606).

Almost surely, 2^{210121120111211} is an apocalyptic number.

210121120111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121120111211 is an equidigital number, since it uses as much as digits as its factorization.

210121120111211 is an odious number, because the sum of its binary digits is odd.

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

Adding to 210121120111211 its reverse (112111021121012), we get a palindrome (322232141232223).

The spelling of 210121120111211 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, two hundred eleven".