1221120102011 has 4 divisors (see below), whose sum is σ = 1221146439072. Its totient is φ = 1221093764952.

The previous prime is 1221120101989. The next prime is 1221120102017. The reversal of 1221120102011 is 1102010211221.

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 1221120102011 - 2¹⁰ = 1221120100987 is a prime.

It is a super-2 number, since 2×1221120102011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221120102017) 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, 13098860 + ... + 13191753.

It is an arithmetic number, because the mean of its divisors is an integer number (305286609768).

Almost surely, 2^{1221120102011} is an apocalyptic number.

1221120102011 is a deficient number, since it is larger than the sum of its proper divisors (26337061).

1221120102011 is an equidigital number, since it uses as much as digits as its factorization.

1221120102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26337060.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221120102011 its reverse (1102010211221), we get a palindrome (2323130313232).

The spelling of 1221120102011 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred two thousand, eleven".