1101221012121 has 16 divisors (see below), whose sum is σ = 1519564828800. Its totient is φ = 708533578368.

The previous prime is 1101221012107. The next prime is 1101221012159. The reversal of 1101221012121 is 1212101221011.

It is a happy number.

It is not a de Polignac number, because 1101221012121 - 2²³ = 1101212623513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101221012121.

It is not an unprimeable number, because it can be changed into a prime (1101221012621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2455741 + ... + 2869338.

It is an arithmetic number, because the mean of its divisors is an integer number (94972801800).

Almost surely, 2^{1101221012121} is an apocalyptic number.

It is an amenable number.

1101221012121 is a deficient number, since it is larger than the sum of its proper divisors (418343816679).

1101221012121 is a wasteful number, since it uses less digits than its factorization.

1101221012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327488.

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

Adding to 1101221012121 its reverse (1212101221011), we get a palindrome (2313322233132).

The spelling of 1101221012121 in words is "one trillion, one hundred one billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".