1101221222121 has 12 divisors (see below), whose sum is σ = 1633643495172. Its totient is φ = 714305657376.

The previous prime is 1101221222119. The next prime is 1101221222131. The reversal of 1101221222121 is 1212221221011.

1101221222121 is a `hidden beast` number, since 1 + 101 + 221 + 222 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 787132712025 + 314088510096 = 887205^2 + 560436^2 .

It is not a de Polignac number, because 1101221222121 - 2¹ = 1101221222119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101221222094 and 1101221222103.

It is not an unprimeable number, because it can be changed into a prime (1101221222131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1653484986 + ... + 1653485651.

It is an arithmetic number, because the mean of its divisors is an integer number (136136957931).

Almost surely, 2^{1101221222121} is an apocalyptic number.

It is an amenable number.

1101221222121 is a deficient number, since it is larger than the sum of its proper divisors (532422273051).

1101221222121 is a wasteful number, since it uses less digits than its factorization.

1101221222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306970680 (or 3306970677 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1101221222121 its reverse (1212221221011), we get a palindrome (2313442443132).

The spelling of 1101221222121 in words is "one trillion, one hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".