1212210221111 has 2 divisors, whose sum is σ = 1212210221112. Its totient is φ = 1212210221110.

The previous prime is 1212210221087. The next prime is 1212210221147. The reversal of 1212210221111 is 1111220122121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212210221111 is a prime.

It is a super-4 number, since 4×1212210221111⁴ (a number of 49 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212210221111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212210211111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105110555 + 606105110556.

It is an arithmetic number, because the mean of its divisors is an integer number (606105110556).

Almost surely, 2^{1212210221111} is an apocalyptic number.

1212210221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210221111 is an equidigital number, since it uses as much as digits as its factorization.

1212210221111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1212210221111 its reverse (1111220122121), we get a palindrome (2323430343232).

The spelling of 1212210221111 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, one hundred eleven".