11010101220121 has 4 divisors (see below), whose sum is σ = 11010111877044. Its totient is φ = 11010090563200.

The previous prime is 11010101220113. The next prime is 11010101220137. The reversal of 11010101220121 is 12102210101011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4235923794496 + 6774177425625 = 2058136^2 + 2602725^2 .

It is a cyclic number.

It is not a de Polignac number, because 11010101220121 - 2³ = 11010101220113 is a prime.

It is a super-3 number, since 3×11010101220121³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11010101221121) 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 3 ways as a sum of consecutive naturals, for example, 3589600 + ... + 5908081.

It is an arithmetic number, because the mean of its divisors is an integer number (2752527969261).

Almost surely, 2^{11010101220121} is an apocalyptic number.

It is an amenable number.

11010101220121 is a deficient number, since it is larger than the sum of its proper divisors (10656923).

11010101220121 is an equidigital number, since it uses as much as digits as its factorization.

11010101220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656922.

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

Adding to 11010101220121 its reverse (12102210101011), we get a palindrome (23112311321132).

The spelling of 11010101220121 in words is "eleven trillion, ten billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".