1001220211111 has 4 divisors (see below), whose sum is σ = 1001226016792. Its totient is φ = 1001214405432.

The previous prime is 1001220211099. The next prime is 1001220211127. The reversal of 1001220211111 is 1111120221001.

It is a happy number.

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 1001220211111 - 2¹³ = 1001220202919 is a prime.

It is a super-2 number, since 2×1001220211111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001220211091 and 1001220211100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001220218111) 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, 2635980 + ... + 2991793.

It is an arithmetic number, because the mean of its divisors is an integer number (250306504198).

Almost surely, 2^{1001220211111} is an apocalyptic number.

1001220211111 is a deficient number, since it is larger than the sum of its proper divisors (5805681).

1001220211111 is an equidigital number, since it uses as much as digits as its factorization.

1001220211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805680.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1001220211111 its reverse (1111120221001), we get a palindrome (2112340432112).

The spelling of 1001220211111 in words is "one trillion, one billion, two hundred twenty million, two hundred eleven thousand, one hundred eleven".