1212221101211 has 4 divisors (see below), whose sum is σ = 1212300248400. Its totient is φ = 1212141954024.

The previous prime is 1212221101193. The next prime is 1212221101213. The reversal of 1212221101211 is 1121011222121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212221101211 - 2¹⁰ = 1212221100187 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 1212221101211.

It is not an unprimeable number, because it can be changed into a prime (1212221101213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39550616 + ... + 39581253.

It is an arithmetic number, because the mean of its divisors is an integer number (303075062100).

Almost surely, 2^{1212221101211} is an apocalyptic number.

1212221101211 is a deficient number, since it is larger than the sum of its proper divisors (79147189).

1212221101211 is an equidigital number, since it uses as much as digits as its factorization.

1212221101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79147188.

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

Adding to 1212221101211 its reverse (1121011222121), we get a palindrome (2333232323332).

The spelling of 1212221101211 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred one thousand, two hundred eleven".