1121221001111 has 4 divisors (see below), whose sum is σ = 1126912478472. Its totient is φ = 1115529523752.

The previous prime is 1121221001081. The next prime is 1121221001113. The reversal of 1121221001111 is 1111001221211.

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 1121221001111 - 2¹⁴ = 1121220984727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121221001113) 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, 2845738385 + ... + 2845738778.

It is an arithmetic number, because the mean of its divisors is an integer number (281728119618).

Almost surely, 2^{1121221001111} is an apocalyptic number.

1121221001111 is a deficient number, since it is larger than the sum of its proper divisors (5691477361).

1121221001111 is an equidigital number, since it uses as much as digits as its factorization.

1121221001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691477360.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1121221001111 its reverse (1111001221211), we get a palindrome (2232222222322).

The spelling of 1121221001111 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, one thousand, one hundred eleven".