1222021211111 has 4 divisors (see below), whose sum is σ = 1222313774832. Its totient is φ = 1221728647392.

The previous prime is 1222021211107. The next prime is 1222021211123. The reversal of 1222021211111 is 1111121202221.

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 1222021211111 - 2² = 1222021211107 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 1222021211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222021211171) 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, 146275595 + ... + 146283948.

It is an arithmetic number, because the mean of its divisors is an integer number (305578443708).

Almost surely, 2^{1222021211111} is an apocalyptic number.

1222021211111 is a deficient number, since it is larger than the sum of its proper divisors (292563721).

1222021211111 is an equidigital number, since it uses as much as digits as its factorization.

1222021211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292563720.

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

Adding to 1222021211111 its reverse (1111121202221), we get a palindrome (2333142413332).

The spelling of 1222021211111 in words is "one trillion, two hundred twenty-two billion, twenty-one million, two hundred eleven thousand, one hundred eleven".