1121021101221 has 16 divisors (see below), whose sum is σ = 1708249025664. Its totient is φ = 640573588224.

The previous prime is 1121021101219. The next prime is 1121021101243. The reversal of 1121021101221 is 1221011201211.

It is a happy number.

It is not a de Polignac number, because 1121021101221 - 2¹ = 1121021101219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121021101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121021101201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109625 + ... + 1863681.

It is an arithmetic number, because the mean of its divisors is an integer number (106765564104).

Almost surely, 2^{1121021101221} is an apocalyptic number.

It is an amenable number.

1121021101221 is a deficient number, since it is larger than the sum of its proper divisors (587227924443).

1121021101221 is an equidigital number, since it uses as much as digits as its factorization.

1121021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824860.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1121021101221 its reverse (1221011201211), we get a palindrome (2342032302432).

The spelling of 1121021101221 in words is "one trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, two hundred twenty-one".