1001221120111 has 4 divisors (see below), whose sum is σ = 1001224449000. Its totient is φ = 1001217791224.

The previous prime is 1001221120091. The next prime is 1001221120121. The reversal of 1001221120111 is 1110211221001.

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 1001221120111 - 2³⁵ = 966861381743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001221120091 and 1001221120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221120121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162921 + ... + 1831618.

It is an arithmetic number, because the mean of its divisors is an integer number (250306112250).

Almost surely, 2^{1001221120111} is an apocalyptic number.

1001221120111 is a deficient number, since it is larger than the sum of its proper divisors (3328889).

1001221120111 is an equidigital number, since it uses as much as digits as its factorization.

1001221120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328888.

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

Adding to 1001221120111 its reverse (1110211221001), we get a palindrome (2111432341112).

The spelling of 1001221120111 in words is "one trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred eleven".