100011011220121 has 4 divisors (see below), whose sum is σ = 100011369960244. Its totient is φ = 100010652480000.

The previous prime is 100011011220101. The next prime is 100011011220247. The reversal of 100011011220121 is 121022110110001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28545629381721 + 71465381838400 = 5342811^2 + 8453720^2 .

It is a cyclic number.

It is not a de Polignac number, because 100011011220121 - 2⁵ = 100011011220089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100011011220101) 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, 178951560 + ... + 179509561.

It is an arithmetic number, because the mean of its divisors is an integer number (25002842490061).

Almost surely, 2^{100011011220121} is an apocalyptic number.

It is an amenable number.

100011011220121 is a deficient number, since it is larger than the sum of its proper divisors (358740123).

100011011220121 is an equidigital number, since it uses as much as digits as its factorization.

100011011220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358740122.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 100011011220121 its reverse (121022110110001), we get a palindrome (221033121330122).

The spelling of 100011011220121 in words is "one hundred trillion, eleven billion, eleven million, two hundred twenty thousand, one hundred twenty-one".