1111122101221 has 16 divisors (see below), whose sum is σ = 1233095270400. Its totient is φ = 992791280880.

The previous prime is 1111122101207. The next prime is 1111122101227. The reversal of 1111122101221 is 1221012211111.

It is a cyclic number.

It is not a de Polignac number, because 1111122101221 - 2²¹ = 1111120004069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111122101195 and 1111122101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111122101227) 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 15 ways as a sum of consecutive naturals, for example, 3567171 + ... + 3866128.

It is an arithmetic number, because the mean of its divisors is an integer number (77068454400).

Almost surely, 2^{1111122101221} is an apocalyptic number.

1111122101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111122101221 is a deficient number, since it is larger than the sum of its proper divisors (121973169179).

1111122101221 is a wasteful number, since it uses less digits than its factorization.

1111122101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433544.

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

Adding to 1111122101221 its reverse (1221012211111), we get a palindrome (2332134312332).

It can be divided in two parts, 1111 and 122101221, that multiplied together give a palindrome (135654456531).

The spelling of 1111122101221 in words is "one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred one thousand, two hundred twenty-one".